New DLR rolling stock

That is by the end of March.

Train 201 used during 24 hour partial-closure of the DLR to successfully complete ASC Automatic Speed Control testing of the new B23 train under signalling control at full line-speed.
As per our previous closures, testing the B23 new trains VOBC Vehicle On-Board Controller and its integration with the DLR network when under full signal control.

Excellent news. I'm all for this levelling-up.
Hoping to see them on the Durham Coast route soon...

Infrastructure and public transport investment is not zero-sum. The reason the north has not got enough investment over many years is because governments have not invested in it, not because they've invested money in other regions - indeed they've almost universally under invested there as well.
Demand politicians give you what you need, do not complain about others getting what they need.

"The capital’s productivity growth is stalling, according to a stark Centre for Cities analysis, unemployment remains higher than in other English regions, and there’s an escalating housing crisis." Government knows value of transport infrastructure investment in London, but withholds it anyway

The doors have to be somewhere! I am informed that SDO and OPO CCTV have been carefully thought through for both these rolling stocks.
Fitting of PEDs does give any operator an issue when the time comes later for the next stock renewal. But I guess London's first experience of this will be when the Jubilee fleet renewal comes around. I seem to recall an old thread speculating how that will go...

The doors on the 24TS are close to evenly spaced, but not quite. They are 5184mm centre-to-centre between pairs on any one car, and 6774mm centre-to-centre between adjacent pairs across two cars. I'd say this is fairly close to optimal and suitable for PEDs to lock in.

On the DLR B23 trains, various carriage length / bogie placement / articulation options were considered by both the unsuccessful bidders and CAF. The 2-3-2-3-2 door distribution maintains the same number of doors as on the existing fleet on the chosen five car format.
I'd consider it unfortunate if PEDs locked in this carriage format and door distribution, which seems very much chosen to minimise fleet purchase cost above all else, preventing other options being used in future fleets.

Regarding Jubilee 96TS and PED replacement, I believe the approach considered most effective to enable gradual transition without a long term closure of the extension is to first install new PEDs which keep the current door locations, but with wide double doors where the pairs of single doors are now. New trains with suitably aligned double doors could then be introduced gradually. However assuming two double doors per car, this would mean ten cars in total, which being an even number isn't compatible with the 24TS architecture of bogies on odd-numbered cars only, so some variant on the bogie placement would be required.

Having played about with some scale drawings, an 11 car 24TS would have reasonably closely matching door alignment to a 96TS - I think within the margin of what could be accommodated by replacement PEDs compatible with both stock. The outermost saloon doors on the end cars would sit slightly beyond where the cab doors are now and may require SDO, while the cab would be in the tunnel as will be common on the Piccadilly.
A Central/W&C derived train with slightly shorter cars may align even better, but I don't know what their exact car lengths and door spacing will be.
I fear we've drifted rather off topic though...

That's 19 trains to modify as necessary in light of ongoing testing of first two trains!

update 16/10:

At the end of May there were 12 trains completed (see above), and 25 now, so 13 built in 5 months. By the time the first train enters service in March 2024 they will have completed about 38 of the 54, with the total build finished around the end of the calendar year. I can't recall a previous build that got so far ahead of entry to service. That requires a lot of costly storage space. And hopefully the current testing doesn't reveal fixes required for the whole fleet! The 2009TS pre-production pair of trains were scrapped after testing since so many modifications were required for the fleet build that it was cheaper to start again!

The 'New tube for London stock' thread has been noting that the new Picc trains are likely to enter service one by one, displacing an old train each time, as has been normal practice. I wonder how this fleet is to enter service, given the number of trains already built. Will there be a large changeover at a bank holiday weekend closure, introducing a tranche of new trains? One a week would make little impression on the backlog, taking a year to complete.

The first two trains were delivered to Beckton depot in January and February 2023, with the third train to be delivered in December 2023. The first new B23 train is due in passenger service by spring 2024, with a steady-state acceptance into passenger service of two trains per period following the first train. Scraping of old B92 trains commences following introduction of the new trains in 2024. link p.5 / 10

Will the B23s be used on particular DLR routes or are they just going to be mixed up everywhere?

I suppose once they've all landed in 2026, the system will be running the 54 B23Ks and the remaining 24 B07s only, which will always run in threes, so only 8 trains max. So the B23Ks will certainly be running everywhere, except maybe one route.