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If you're looking for an infection map, try this.
http://www.bungie.net/Forums/posts.aspx?postID=66320905&p ostRepeater1-p=1#66339250
Not that is a very different experience from standard infection. The thread should tell you everything you need to know.
Outside of infection, there are a few maps coming out by a new forger, but he's pretty good. Try these:
Fission (2 - 6 players, Team Slayer, FFA)
Paradise Creek (4 - 16 Players, Team Slayer, CTF, Assault)