We've been working on getting out a preview to of Opera 7.50, but unfortunately, it still needs some work before it can be made public. Just to make it clear, there will be no releases this week(end). A new preview will be out next week at the earliest, but it all depends on when we can fix the issues that remain before we feel it's ready for release.
We really want to get a new preview out there to get more feedback, but remember that once it arrives, it is still just a preview, and things aren't set in stone yet. The most important part right now is to test M2 further and get more feedback on the UI tweaks done since preview 1.
You are in for a few small surprises 🙂