I hope it's 2GB stick not two 1GB sticks.
Considering the thing has 8 RAM slots, who cares? If you're buying 16 GB of RAM to fill every slot, you can afford not to care. At least it (hopefully) won't be 512MB sticks like it is now. Personally, i'm planning on going 4GB+. If the base has 2 GB, i may consider going to 8 GB, and if it has 4 GB base, i DEFINITELY will go to 8 GB. 3rd party upgrade of course, much cheaper.
As for the quiet issue, i have been in the apple store when it was dead quiet with not many people in there and i didn't hear it at all. Granted, that was in a retail environment, but that's the only time i've used one. I will be purchasing one, though, with the next revision if it has blu-ray support. If it doesn't, i still may, because my iMac G5 2.1GHz/1.5GB is a bit tired of doing HDV video editing. With leopard, my iMac will SCREAM as my general use desktop, but for video it's a bit slow.
the 1600 MHz FSB, possibility of dual quad-core across the line, 24 MB cache, and maybe (please) 1 TB hard disks is what most excites me about this.