Well there's Mamayev of course, that's currently in the beta and will be released with the next patch. Other maps are definitely coming.
The maps I, and many others, are looking forward to are ones that are large and require half tracks, but TWI is only going to start work on halfies after they're done with the next two tanks.
Other than that there are many maps being worked on community members that, due to problems with the SDK and the system that downloads maps in game, have been taken off the server map cycles. The fixes to these issues *may* be included in the next patch. The best (so far) example of map work (not to say that the other's maps are bad, but this map is not just placing of objects but the entire creation of new ones!) is harley's map, the latest screenshots of which are at
[url]http://forums.tripwireinteractive.com/showpost.php?p=1062889&postcount=569[/URL]
Also, many of the maps made great in Ostfront were from mod competitions, where modders competed to make the best map and the best mapper was awarded a prize. I hope to see these competitions come around again once the SDK problems are fixed.