UPDATE: Treyarch has officially announced, via the message of the day, that the Revolution DLC Free Trial will start Friday, May 24th at 1pm EST (10am PDT) and will end May 28th, at 10am PDT.
According to hidden html code (shown below) discovered by @LiamFTWinter in the Xbox Live Upload Registry, Black Ops 2 Revolution DLC will be available as a free trial on Xbox LIVE soon. The image that he sent shows that the trial will expire on May 28th at 10am PDT.
This is the first time a Call of Duty DLC will be offered as a free trial. No word yet if this will be available to PS3/PC fans.
Also, there’s been some rumors/speculation going around about DLC 3 / 4. Some rumors point to a July 2nd launch for DLC 3, and an August 27th launch for DLC 4. No information has been confirmed yet about this, but we’ll keep you updated.