I'd like not to see offline contacts, but can't find an option for that. And the main window menu is gone. Will that be back?

I agree I am used to only displaying offline contacts. Also my contact groups are gone.

Main menu will not be back afaik. Right-Click is the go here. I catch myself sometimes aswell looking for the menu.

@ Contact groups: pfft.. I miss them aswell. But somehow it is not clear where this will go ...

Main menu is at the bottom of the screen - the little cogwheel next to green plus ("add people") icon.

Contact groups is a missing feature atm. We're figuring the bestest way to have those.