I just read an article on wikipedia (french wikipedia) which declares the end of commercialisation of the i7 920 for the end of december 2010 (in fact the 24th) because of the incoming i5 sandy bridge.
I tried to find other informations and sources but couldn't put my finger on anything.
Yep, 920 is done and the 930 is right behind it. 950 might last awhile and the price should go wayyyy down after sandybridge kicks off. Intel is pushing the sandybridge really hard so they're quitting with some of the "older" stuff.
it was mentioned a while back the I7 920 would be discontinued. The Sandy bridge platforms will fill the 300usd and up gap. I take it the 970 might come down a bit and the high end sandy bridge models will fill its spot and other side of the 980x. So that fills every gap.
I think they might drop the I5 to under the 200usd mark.
I don't think any of the 6 core Gulftown processors will drop much until a Sandy with more than 4 cores comes out, which probably won't be until next summer.