Decompression kills are shared equally between live marines (counting as assisted kills).
Suiciding while infested is no longer a good idea.
The Swarm Queen is now capable of smashing Sentry guns.
Hand grenades now have a wider area of effect and will detonate when passing close to aliens.
Medics will see injured marines with a flashing red name.
Heal effect changed to give instant feedback.
Empty servers will reset to the Sigma campaign (there is a server setting to disable this if desired).