Snake man informed us on our forums that they have released a new version of the "PMC ArmA 2 WRP Demo" (a desert island) for ArmA 2.

Quote Snake man:
Its an WRP technology demo including 51km x 51km desert terrain with many ruined cities. This is not really a "real" terrain addon in the sense, but surely some people will find it useful. It comes with 4 missions which give you some quick fun.

PMC has just released v1.1 of this terrain, it now includes one extra terrain without any buildings so multiplayer "clans" can build their own cities where ever they want.