^^ I doubt VW will build it, but with the 2.5 being replaced by a 1.8T in the MKVII (AFAIK), it should be easy enough to build your own.
If the MKVII wagon is as gorgeous as the pictures suggest, I might just have to trade my GTI for one. The 1.8T should be decently powerful stock, but I'm sure with a modest tune it would be as strong as my stock GTI (which is still plenty for me). Add some springs and dampers, and Bob's yer uncle!
Still, I'd be waiting until MY 2016 or so, just to let them work out any bugs with the new platform and assembly line. No rush, as my 2010 GTI has been plenty reliable so far, and likely has a few more trouble-free years ahead of her.
(BTW, I got a letter in the mail a while ago: warranty on the intake manifold has been extended to basically forever - 12 years and 180,000 kms, IIRC. Mine's good, but apparently breakage is a question of when, not if. Hopefully mine breaks before the regular power train warranty is up - might be able to save a few bucks on carbon-deposit cleaning, too)