don't get too excited, neither the patch or the map pack are available yet (and it does appear they will be separate).  there's been a lot of chatter and speculation, so I wanted to share a link to a post made by one of the CoD developers.  Perhaps you've seen it already, but in case you haven't:Here it is.

Cliff's notes for the lazy.  Map pack for PC is still in development/testing.  Patch is in testing and seemingly coming soon..no dates for either.

Bump for an update:

Looks like there will be clearer details next week, but the map pack will be delivered within patch v1.5

Developer's Post Here

Sounds like we may have a patch and map pack this lifetime.