Looks like Unfinished Swan and Journey are possibly coming to PS4 as well, probably with the same cross-buy promo attached.
(Watch out, it's a NeoGAF link. According to others, you may get infected with uncontrollable Sony fanboyism)
I wish they were porting a little bit cooler games, but I guess free is free. I highly doubt I'll ever want to play Flow, Flower, or Journey again. Maybe if they have separate trophy lists, but I highly doubt it.
EDIT: Actually looks like there probably will be separate trophies for those 4 confirmed games (Flow, Flower, Escape Plan, Sound Shapes).