The wait time has been running 4-6 weeks - I ordered mine Feb 23 and got it March 24, but it looks like the wait is creeping up toward 6 weeks for the people just after me.
If I were a daily commuter, I'd be thinking more in terms of a protective bag for the Kindle to go in, rather than a different cover. The cover leaves the sides exposed, which in turn lets crud(tm) get between the cover and the screen, especially if the Kindle is shoved into a bag.
Waterfield has some nice-looking bags for the Kindle
http://www.sfbags.com/