Yesterday Valve announced the Alpha release of their Dota 2 Workshop Tools. The tools allow for the creation of custom maps and game modes for Dota 2.
Valve say that this update is a ‘developer focused release’, so the system requirements won’t suit everyone at the moment. Currently it requires a 64-bit version of Windows, along with a Direct3D 11 compatible GPU.
The devs are working on bringing the system requirements down, so that more people will be able to run the tools. But, they wanted to ‘get the tools out there now so developers could start working on their Custom Games’. The Steam Community thread has more details and head over here if you want info on how to install and use the tools.
The update also mentions the new Dota 2 heroes, Techies. They were initially hinted at within The International 2014 Compendium’s Stretch Goals, and then later revealed during the TI4 All Star Match. Valve say they are working on the Compendium Stretch Goals right now, and they’re expecting a release by the end of August.
If you are desperate to play as the Techies now however, I did discover a way to do it, which you can read about over here.