Depending what region you live in you may be able to get RE:Chain of Memories on PS2(although that's technically KH 1.5), other than that Square Enix has no Kingdom Hearts games planned or out on PS2
Rumor has it they are making KH3 for the Wii. This has not been confirmed.
Kingdom Hearts III will be released for the Playstation 4 and Xbox One. I think it's safe to say that there's no chance of any more Kingdom Hearts games being made for the PS2, PSP, DS, or Wii.