In addition I remade, expanded, and made various tweaks throughout the singleplayer campaigns. That's a jump from 128x128 (original size used for everything from model skins to maps) to 1024x10x2056. Both the singleplayer and multiplayer collection of maps are redone with true high resolution textures. Nearly all of the sounds are replaced or beefed up. All of the old block-like models are replaced with new extremely detailed characters, weapons, HUD objects, and everything in between (many of which are redone versions from 2010's AvP3 made by the same developer, Rebellion). To put it simply, AvP Redux is a remake of the original Aliens vs Predator PC game from 1999/2000.
People who just heard about this mod are probably wondering what it is.