As mentioned, barring any major snaffu its due to go online on the 29th.
As you might expect there are going to be flow regulations for a significant period of time. Tactical re-routings by CFMU will take of some of it, but at the end of the day delays are inevitable.
Theres still a chance it will be delayed - on the last shadowing day (beginning of Feb) there were still some errors being thrown out of the system. Nothing that would endanger traffic, but just stuff that slows the controller down - hence the need for the reduction in traffic numbers.
The same system is also due to go online with DFS further into the future, so expect a similar story when that happens.
A new system (although not necessarily this one
) is really needed. The current MADAP system was designed in the 70's and there are certain parts of the code that no-one can understand any more as all the techies have retired.