The earlier rumor of Windows 8.1 update 2 coming on Patch Tuesday now seems confirmed. A new screenshot with information on this update has been posted on Twitter. As can be seen in above screenshot the standalone update will get released on 12th August.
The above screenshot mentions new features and updates, but doesn’t give any detail into it. The Windows 8.1 update 2 is however not supposed to bring any major new features, but will bring improvements in system performance.