An update for Aliens: Colonial Marines is currently rolling out on Xbox 360 (3/7) and PlayStation 3 (3/8) with a PC update expected to release in the near future.
Details on the Xbox 360 and PlayStation 3 updates can be found below:
Xbox 360 Update Information
PlayStation 3 Update Information
The upcoming PC update will share many of the changes contained in the Xbox 360 and PlayStation 3 updates, along with some additional changes that will be part of future updates for the Xbox 360 and PlayStation 3 as well as some PC-specific changes. Notes will be posted as they become available.