When The Unfinished Swan and Journey are ported to PS4, players who own the games on PS3 will not have to pay again to experience the new versions -- Cross-Buy support is confirmed!
Someone in the PlayStation Blog comments also asked "Will it be 500 [frames per second]?" and that, hilariously, got an actual response from Sony Santa Monica. "I've never heard of a game that is 500FPS, but the team is targeting 60FPS," said community strategist Aaron Kaufman.
It's been so long since I've played Journey that I might as well continue waiting until I inevitably get a PS4. Perhaps by then I'll have forgotten more of the game. That's my hope, anyway.