I don't know where I threatened to abandon GJ? That was never the case and never will be the case. The original plan was as follows.
1. Upgrade for CB 2.x compatibility as GJ 2.8
2. Rewrite to CB Communities
I'm guessing the CB Communities rewrite may have been confused with abandoning it? It then changed to the following.
1. Upgrade for CB 2.x compatibility as GJ 2.8
2. Rewrite to GJ 3.0
Now it's as follows.
1. Rewrite to GJ 3.0
I've already completely rewritten GJ core. I've already rewritten GJ About integration. I'm about half way through rewriting GJ Events integration.
If you're that reliant on GJ I can't understand why you upgraded to CB 2.x. GJ works perfectly fine on CB 1.x and continues to do so. If it's absolutely vital to your site then do not upgrade your site.
Below are some screenshots of current progress.
All Categories:
Category:
Group (Users):
Group (Events):
Group Events isn't done yet though. I've only just yesterday started redoing its tab. So the above is a work in progress. Note categories don't have to be used either. It's now possible to use GJ without them. There's an All Groups page, Joined Groups page, Invited Groups page, My Groups page, etc..
Today I spent most of the day writing a new Date class for CBLib so we can finally have more translatable dates, which was needed for GJ Events.