I'm not sure what they are working on, but keep in mind there could have been other issues they had to deal with, perhaps water damage, replacement parts for the facade, etc. Not to be pessimistic, but what they're working on is anyone's guess right now.
How long is the NexGen project supposed to take? Are we talking about not getting an overhauled Pan until 2012 or 2020?
I have got no idea, but I am sure Martin, Lee, Raven and others may have an approximate window for the project to be completed. Last thing I heard, if I remember correctly, they were using the old WoL building to test it.
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