I thought about it myself. There are three things I can see happening. An HD plug, an iSight, and a complete overhaul of the design to look like the new iMac. I saw the new iMac and I can see the appeal, but the new look doesn't appeal to me. The lack of the HD plug doesn't phase me, and the iSight doesn't bother me.
The specs as they are in my opinion will last quite a while so I took the plunge. I don't and do not believe I'll regret it if they update in another couple of months.
The 30" was a great decision. For money saving purposes I thought I would get the 23" since I have a 20" dell, now that I have the 30" I am quite pleased. Upon first edit of some photos I knew it was the right choice.