At the moment, my gaming group is pretty hard against a lot of the changes (and excited to steal some others and incorporate them).
But even if every single one of us was chomping at the bit for 4E, we got burned buying 3E when it first came out, and then had to rebuy the new printing that 'fixed' a bunch of stuff, so we are dead-set against pre-ordering. If we decide to try it out, we won't start picking up core books until it's been out six months or so, to give them time to iron out the kinks.
I'm not afraid of spending money on gaming books, even gaming books I'm never gonna use (my complete collections of Mage, Wraith, Werewolf, Kindred of the East, etc. game books I've never gotten to use stand in mute testimony to that!), but I'm sure as heck not going to get snookered into buying multiple copies of the same book again!