I was told 3.7.8 is supposed to be out by end of year. Bugs fixed as well as new firmware for all the Plus backs. I believe it will work with Panther as well, but might have heard that wrong.
Capture 4 non pro is lacking tethered support, Styles, Color Editor, Sessions, and more. I'm also finding it quite buggy- it's crashed several times on me already. It's pretty fast, though, and Previews look good. Profiles also look better- I think it will be a good product.
Re: an earlier comment about Canon files, DPP has always had a better look than Capture One. Clunky interface, but gorgeous color.