I was thinking about this a while ago, I'm really not sure how it'll work.
I'm presuming regardless of when they sign up the new maps for the future title will only become available when they renew to elite 2.0. (Basically what you said)
The fact that, regardless of when they sign up they can still download previously released maps and content.
Elites content only entitles a premium member to 22 pieces which everyone will have by November, regardless of when they sign up.
Message was edited by: xbevz