GDC 2010 interview with UGO, BioWare's Dr. Ray Muzyka said of Warhammer Online, "Right now it's [a] really profitable business unit within my group." Muzyka went on to say they've actually seen more people come into the game since enacting the free-to-play model on the game's earlier levels, and that he personally felt they were working.
In fact, by the sounds of it, Warhammer Online is due for some interesting announcements in the future. Another of Muzyka's comments on the title was, "We have new content planned and all kinds of cool expansions for it." We don't know how much more clear cut a message can be than that. And hey, it's good news! We're looking forward to our playable Skaven and Lizardmen, Mythic and BioWare.