MojoKid (1002251) writes News and rumors about Valve's upcoming Source 2 engine have been buzzing for months, but a recent update to DOTA 2 contains the most persuasive evidence yet that a major engine is in the works. After the last patch, the game now contains a number of programmed default paths, directories, and file names that didn't previously exist. Source-related DLLs and executables (engine.dll, vconsole.dll) have been updated to "engine2.dll" and vconsole2.dll." The tileset editor has a default Source path. There's also now an option to save files as "Source 1.0 Map Files" where no previous option existed. Here's the funny thing — while most people think of a game screenshot as the best evidence you can buy, low-level file directories, default trees, and changed application behavior is actually more persuasive. Source 1.0 was never updated to support DX11 or OpenGL 4.x, and while the engine can still be used for impressive titles, its DX9 limitations and ancient modding tools are showing their age. It's time to bring the game engine into the modern world, and hopefully these DOTA 2 updates mean that Valve is moving closer to that goal.