I don't see quadchannel memory in shops...
Would I expect to see it by the time these boards are released?
Its 4 sticks of normal memory, its nothing special, its also 8-11 months away at this point. Though there will be over priced "quad channel memory packs" by then, which will contain 4 sticks of normal memory and be no better than 2 packs of dual channel memory.
Anyway, what they are saying about $999 and above processors I think they are more saying is, if you want an upgrade to CURRENT top end hex core i7's, the only new options will be the even higher hexcore i7's, IE they released a i7 990x, which is the only upgrade from a 980x and costs you $999 +.
The Sandy Ex platform end of year should have both hex and octo cores. I'd expect the octo cores to have around the same top end pricing as current hex cores, maybe a touch more, but hex cores should move from that $999 type pricing to a LOT lower.
THe highest quad core Sandybridge is what, $316, we'll probably see hexcores at around $400-700 and the new octo cores from $800-1000. So a hexcore won't be disgustingly expensive. The mobo's will be expensive though, quad channel memory, ouch, thats a lot of traces, signalling issues, added layers required(maybe not that bad as it looks likely they'll go two channels either side of the cpu socket on the mobo which makes it a little easier).
This is largely why AMD could have a great year, octo cores aimed at mainstream pricing. Top end AMD octo's will be around quad core Sandybridge pricing, probably $250-400 for various octo cores, with quad versions coming in at, dunno, maybe £125-250. Cheaper mobo's aswell as AMD ones are and still dual channel(as far as we know). Meaning AMD should pretty much spank Intel in the midrange/low end, in both actual performance, and performance/price ratio.
We'll have to wait till Haswell for midrange 8 core chips from Intel. Ivy bridge is Q1 next year, basically 22nm shrinks of Sandybridge chips, and end of 2012 will be 22nm new architecture chips with 8 cores finally hitting mainstream for Intel, though they should be pretty damn tasty performance.