TA3D is a real time strategy game. It started as a new 3D engine for Total Annihilation, now the engine is working, you can play campaigns, skirmish (against AI or running some game script) and multiplayer games. Even if we're still using some data from Total Annihilation (until we replace all of them with our own stuffs). It aims to full compatibility with Total Annihilation and its mods but it brings a new engine. It's a bit like Supreme Commander and Total Annihilation except that it stays closer to Total Annihilation gameplay.
TA3D development has been quite intensive lately. Lots of bugs have been fixed (fonts are no more blurry, water doesn't get strange after a while, ...). New skies, trees, rocks are being made to replace the old skies and Total Annihilation's 2D sprites.
The engine is not perfect, it still has bugs but it's getting stable. If everything goes as expected TA3D 0.6 should enter RC stage and become stable soon :). In the mean time you can help testing it and report bugs. There is a new crash report system which can be used to send us information about crashes but you can still go to our forums to report bugs which don't crash the game.