I don't know how set in stone it all is, but if Atlus can make it through their problems I think they might drop another SMT game on the PS4. PS4 is way more easier to develop for than the PS3 and probably even cheaper.
I got SMT4 preordered and I'm glad to have it on the 3DS, but I watched the walk through of SMT 3 (since I missed out on it back in the day) and it was amazing. I can only imagine what they could do with the next gen consoles. It would look and sound beautiful on a hdtv and sound system. I think they can really push the franchise to the top of the pack easily.
"Gold, silver, and rubies are nice, but we treasure far above those; knowledge, wisdom, and understanding"