Are Pre-Order's on PSN like Pre-Loading on Steam?

I was looking at just pre-ordering the Last of Us through PSN instead of ordering it off amazon like I normally do and was wondering if its a steam kinda dealie where you pre-load it prior to release and then it unlocks for you to play it on release day or if it just gives you right to download on release day?

YES they said The last of us is going to be the 1st game where at 50% of download it will unlock and you can play !

@jimmyfenix: rad, thanks dude

I was lucky and got a disc of this game earlier today, a friend of mine however purchased the pre-order from the playstation store and he said it only downloaded 147mbs or so. And yes, he's a PS+ member. He's also a stoner though so I take stuff he says with a grain of.. salt.

edit: bad typo!

No, you aren't able to pre-load games normally on PSN yet, unforunately. And as far as what you're friend told you Geirr, I pre-ordered the game the other day and he's probably talking about the theme it gives you right away to download for pre ordering.