Looks like an FPS killer, Davio. Looks amazing as well, though.
Actually the effect is really optimized and doesn't kill the fps too much. I was getting decent performance on my laptop's integrated graphics card. The game runs at a perfectly smooth 60 fps (with the high-setting shaders enabled) on any semi-decent non-integrated card (i have an 8300 GS/128 mb, which is pretty poor in terms of power, and the game runs like melted butter). As mentioned, that's just the high graphics setting, and the original graphics will be available as an option.
lucid: the glow effect originates from a heightmapping shader