It's honestly been so long since the last release that I can't remember everything that's been changed but here's the major stuff:

I feel the need, the need for speed

OpenGL is now used for rendering, which should mean the game runs faster on lower end systems

Where'd I put my x-ray goggles?

Enemies can no longer detect you through walls and other solid objects

There's no escape!

Enemies will now attack you after you've respawned (unlike before, where apparently Frost's body was so mangled that they didn't even recognise him as a threat)

Known Issues

AI for ranged enemies is derpy

Found another issue? Post it in the bug reports forum!