I've been emailed a document that includes several interesting bits about DLR current projects, mainly regarding service changes during it.
Royal Mint Street Junction remodelling. This is where the Tower Gateway and Bank branches split. Currently the route to Tower Gateway is a single lead design which limits capacity, and the two tracks west of there are used bi-drectionally to reach each platform, rather than one for eastbound and one for westbound. Hopefully these two problems will be fixed - they'll have to be given Tower Gateway will in future only have one platform.
Single-line working south of Crossharbour. For two months starting this June the Stratford-Lewisham service will terminate at Crossharbour and the Bank-Lewisham service will terminate at Island Gardens, with cross-platform interchange to an Island Gardens-Lewisham shuttle, as well as parallel bus services. These services will only use one track, enabling the platform extension work to take place on the other.
Canning Town junction rebuild. The new junction for the Stratford International Extension is going in east of Canning Town. From 21 April trains from King George V go to Tower Gateway and trains from Beckton terminate at Poplar. From 30 June trains from King George V switch back to Bank, with Beckton services cut back further to Canning Town. This doesn't seem to reduce the number of trains over the junction, but whatever.
Bank station closing. For 5 weeks starting Christmas Day 2009, Bank will be closed for works relating to the three-car project. This appears to indicate a delay in the start of three-car running (scheduled for late 2009).