Nice and on to the ball there, these boxes have been available for months. The x3620 has been available since at least May 2011 and the x3630 launched in Aug/Sep.
It may seem odd that IBM would update two x86 servers when Intel is prepping its "Sandy Bridge-EP" Xeon E5 processors for launch in early 2012, but the cut-throat competition in the server racket waits for no chip launch. And thus, IBM is revving up two "value priced" Xeon-based servers to compete against Hewlett-Packard, Dell, …
Wasn't the IBM announcement today just two new SKUs that include Windows Storage Server 2008 R2? The x3620 M3 and x3630 M3 with Westmere-EP have been around for a year.
Helloo.... these servers have been available for quite a long while now.