What has been the announcement? The blog is only version updates, which are little at best. It is still stable, but it would be nice if the Zennaware where much more transparent.

Gitti by my findings is by far the best git gui app there is: http://www.gittiapp.com/

But these days, I just use command line - takes a long while to learn, but you get use to it :-)

I'm going with Zennaware is dead.

Got this reply from Cornerstone support staff when asking about it via a support email:
"Branch and merge support will be included in the next free 1.x upgrade to Cornerstone. We are hoping to release this in the coming months."

It's fantastic news that it will be coming! Was hoping for sooner, but later is better than never in this case :-)

I agree with amjaliks:
This feature has been requested at least a year ago and still no action from you? Do you use SVN? Or only "create" a client for it?