I woud suggest either;
Saga of Ryzom, which is looking great right now with the new 'Ring' free expansion and it's free unlimited trial. Really deserves a re-evaluation
OR
Neverwinter Nights 2, which is just looking great in both solo campaign and online mode, and as a bonus shouldnt tie you down for ages, like SoR might, so your ready to go when VG launches.
Of course... a Beta invite is better then both of these, but never that lucky personally so for me it's one or the other.