It's part true, for as far as I can tell, the next few FF's will come both on PS2 and NGC. Don't worry, the PS2 is at good hand, at least for now.
FF XI will be released on PS2 AND NGC, but XII, well there isn't much info about that, but my speculation is that Square won't just drop Sony like that, just look at the costumers of Sony, a lot of people got a PS2, so If they aren't producing any more on Sony's Black Box, then they will miss a LOT of money, 'cause there are a lot of RPG fans.
And FFX in europe will come out in a Special Edition, It'll be released at 4 may. So don't worry, the only one to worry are the X-BOX owners. GNAGNAGNAGNA
I'm just a lurker these days, I feel like an 80 year old gramps, watching his grand children play outside *sigh*