The new terrain editor is available for download in the downloads section. With this update you can now upload your own custom terrains that you've made for use in the custom arenas. We've had this in closed testing and now we're moving that out into open testing. It's a very simple and straightforward to build and upload your terrain using the new utility.
2.263 Update:
Changed the terrain editor installer to the new installer. Changed the default path and added a new group of shortcuts to teh start menu.
Added a new utility that will build terrain resource files from raw terrain files and upload the new terrain for use with custom arenas. Terrain names must be unique and once a terrain has been uploaded, only the original author can upload newer revisions. Once a terrain is uploaded it is then available for any player to use in the custom arenas.
Added a plugin to AC3D to incude support of face/object attributes, DoF's and LoD's. The plugin file is named htcac3d.p and needs to be copied to your AC3D plugins folder if you're using AC3D.
Expanded the elevation functions in the terrain editor. You can now use a paint brush to set terrain elevation and randomize it.
Numerous bug fixes.