Not necessarily RS. I have known EB here to flaut the rules both ways, releasing early and late, regardless of what time the game arrives. Mostly though early releases are for those who have pre-ordered. They give them the game because they don't want the stock sitting around the back when the game is "officially" released. The reason -at least EB has- is that their policy only covers holding the game for a VERY limited period of time, no more than 24 hours. If they get rid of the ordered games early, anything left sitting on their back shelves on the day of release is fair game to all and any customers.
Normally, and I say normally here because we all know it doesn't always work out the way it should, stores received stock about 2-3 days prior to release, as much as 4 or 5 if release is the end of the week. There is usually an agreement which doesn't allow them to "sell" the game "publically" before release, but this doesn't include pre-orders which are technically already paid for and not "public" sales. Occassionally there are terms and conditions which stipulate that it is not to be "distributed" until release - in which case pre-orders can't be "distributed/collected" until the release date either - this is normally only for really really big titles.
Anyhow, my point is that distributing pre-orders before release EB gives more than the stated time for pickup to the customers - which frankly I prefer, allowing them to sell all remaining copies on the actual day of release without breaking contract - which is basically what a pre-order is.
The moral really is just ask if they are in

Most of the time you can talk sales people into anything - especially if you point out that the game can't actually be played until Friday anyway.