As we know, March 18th in the US, 21st in Europe.
Final Fantasy X/X-2 is on the same disc for PS3, X is on cart and X-2 is a download code for Vita.
Limited edition comes with artbook:


Trophies are shared between PS3 and Vita versions
Saves are shared
No cross buy
£30 RRP for both versions, so probably about $50. Confirmation of that would be much appreciated
For the UK release there's not going to be fancy box artwork:



There is in the US:


No idea why saves and trophies are shared but there's no cross buy option, they should have either included all or none of it in my opinion.