I just downloaded it and gave it a spin a few hours ago. It seems pretty similar to the other games, or what I've seen of them, but that's not a bad thing - I'm surprised they've been able to stick so closely to the tone and style of the first 3 games. It seems like a lot has changed with games since the PS2 days.
I'm wondering if they'll add anything new this time around. Maybe Sly's ancestors will introduce some new features and gameplay elements. Even if it's pretty much the same old thing, I think I remember hearing somewhere that this is going to be the longest Sly Cooper game yet, like several times as big as the other ones? That's pretty cool, at least it won't be over in one setting.
My favorite part of the demo was playing as Bently, both in the sewers and in the haking game. He's just got so many neat gadgets.
It also had a surprisingly lengthy dosage of cutscenes to help bring the story up to speed, which was nice.
I still don't even know when this game is supposed to come out, or if it is even out already. oO