Actually, not true. One of the links listed there gives all of the socket 2011 processors that newegg is selling.
http://www.newegg.com/Product/Produ...-na&AID=10521304&PID=4169666&SID=8olvorrgwyh0
There is no E5-1620 or E5-1650 listed there. There are some smaller sites that appear to sell them ( Google shopping turns up some hits).
Throw on top the other major system vendors are still not shipping and it is not really clear what the hold up is here, but there is likely a glitch somewhere. At the very least the vendors are likely doing a slow inventory build up before launch.
Nevermind the hold up on the newest GPU coming out and being available in volume quantities.
Likewise, the fact that some folks whipped up some experiments with some 2011 board and the fastest E5's they could get their hands on to which some benchmark result posting bragging rights really doesn't say much for volume quantity production .... Or anything about a config that will likely ship as a Mac Pro ( speed constraints over noise, power, design , etc . )