Well, seeing that most games we loved have already trransposed onto newer systems such as Devil May Cry, Halo 3, and soon to come Final Fantasy 13, I am most positive that they will not give Kingdom Hearts any special treatment and put it on the ps2.

The last I have heard, is that they plan to give Kingdom Hearts some new things to do, such as motion missions with the SIXAXIS controller and many other things the ps2 is not elligible to do.

So most likely no, do not expect to see it for PS2, and if it does come out for PS2 then shame on me :P.