Magic System?

I too am looking forward to the release of NWN. One thing I have been wondering about though is the magic system. Are they going to stick with the old method of memorizing a limited number of spells which are forgotten on casting or are they going to introduce a 'mana' system? The reason I am asking, is for this reason: what happens in big games when a mage/cleric needs to regain spells. Will all players have to wait for 8 games hours for them to rest, or will the party(s) continue onwards while the magic users slumber for most of the adventure?

I would be interested to hear people's thoughts on this.

[UnForGiven]

I assume that this has already been answered in one way or another, but when
there are 7+ people on a server, how will casters get back their spells? In other words, with
real-time passing for one group, how can another group rest for 8 hours to allow spells to
refresh?
For gameplay reasons, we're making resting instantaneous. We'll limit that,
however, by putting in a limit on how often you can rest within a given period of time. Also,
we're considering adding in an adrenaline factor - if you've just been fighting, you need to
calm down a bit before you can get some sleep. The details are a little complex for a chat
but we'll be explaining it in more detail later. Thanks.