World of Tanks is running a beta on the platform this weekend. Take part and you will win more tanks. This is probably a good thing since the whole game centers around tanks. It's the entire world.
Heva Clonia Online is pushing to open testing starting on the 17th, meaning that you have less than a week to wait if you're enthusiastic for the game but somehow missed the previous (first) closed test. City of Titans, meanwhile, isn't in beta yet, but it is far beyond funded to ensure that there will (hopefully) be a beta down the line.
Oh, and there is a list of games past the break in various states of testing. If something has sneaked into a new beta phase without our noticing or has added a cash shop without warning, let us know so we can investigate.