I think they almost pulled out this year but left it too late, however I do know there is no TOM crews based here at MME this summer, NCL will crew everything. Therefore this summer had to go ahead but then after that will not.
On the subject of XL, well if you look at the NCL base this winter they are selling only 4 destinations so far, compared to their usual 10-15 for the winter (and I think 15-20 in the summer?). This adds weight to the rumour of XL pulling out of NCL.
There also rumours of interesting destinations by FlyGlobespan next summer, not just Europe either.
If everything comes off as planned then it could well be a very interesting summer in 2008!