we don't really know. It was hinted that this week, the week of April 19-April 23 2010 it will be released.
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June 10 2011 for the escalation map pack first strike is already out
I heard that the new map pack will be out in the spring of 2010, followed by another map pack sometime in late summer/early fall. Hope this helps!
Feb 1st for xbox .pc, ps3 etc comes out march 1st. yes but there is a new map pack coming out it is map pack 2 called Escalation for more info go to (See related Link)
There not really random characters; their just added to the storyline.
Unfortunately no. The battery pack is sold separately.