The patch is still under works, but it's almost there. It will feature many fixes and improvements.
Anyway, you don't need to wait for it in order to start mapping: the current release already includes all the entities and features you need to create your own maps.
You can already place and use the other weapons, the Jetpack, the DoubleJump boots, create wind, non-scripted moving platforms, breakable walls, paths that lead the player to the background or the foreground and much more!
In the tutorial section you can find 6 new tutorials that covers all the aspects of HQ2 mapping.
They are very simple and fast, but they do assume you are already familiar with Radiant.
Have fun. :)