Unless you have a really big urge to play a certain title then I would wait. I just bought a PS3 for KH-HD 1.5, but I do also plan on picking up the new Arkham game and maybe Battle of Z.
Storm 3 is pretty boring nowadays. I used to love the game, but I don't have any problems pretending like I don't own it. It's just not fun to play anymore because of all the dumb redundancies you'll run into online. It doesn't even have a good netcode either so you'll only get good connections with people in your same country. Otherwise, it's lag city.
I wouldn't rush to get a PS4 either since there are bound to be some kinks in the first design. Maybe there won't be, but that's just my precaution. If I'm going to spend that much I want to enjoy it as much as possible.