Any luck on the hotkeys? This is a software that seems largely aimed at power users, and having hardcoded hotkeys is crippling for many of us - I see a lot of requests for this on the previous page. May I suggest customization options similar to Tidy Tabs by Nurgo Software? If we had features comparable to this, it might even eclipse tidy tabs, which I chose over Groupy largely because of the hotkeys and better customization options.
Additionally, one thing that I struggle with in Groupy 2 is that I don't want to see the tabs all the time, but when I choose to hide the tabs, if I'm using a tabs program like Chrome I'll often hit the Groupy tabs by accident instead of the Chrome tabs - because they pop down when you mouse close to them and they overlay a large portion of the program's tabs. Perhaps Groupy could either push the tabs down to show both, or implement a solution like tidy tabs does where the tabs are smaller and unobtrusive? You can also explicitly group windows by dragging the "window tab."
Example 1 of 3, Tab Options 1:
Example 2 of 3, Tab Options 2 (fullscreen - can set these to appear from the left too. They have mouseover previews):
Example 3 of 3, Hotkeys: