WP 3.3-RC3 (12/11/2011, and other 3.3-RCx)
Using Chrome 15.0.874.121
In the standard dashboard, creating/editing a post, Ctrl-BkSp no longer deletes previous word, but only does normal BkSp behavior.. I thought this was a standard editor trick (it works in the text area for this bug submission), but it was in 3.2.1 and is gone in the RCs I've seen so far (RC1-RC3).
It's highly useful, and hope it will be back soon.