Last official word I read on this board was per Ian, and it is still in the works; said it was just due to being busy with other things - that is the holdup.
Prior to that, the word (around Winter NAMM '11) was that the E2 and M4 production would be ready around early 2012. That's all I know.
I'm itching for the E2 as well......
(Edited for typos)