Shivering Isles Will Be Final Oblivion Expansion

OXM is reporting that Bethesda's Pete Hines has confirmed that The Elder Scrolls IV: Shivering Isles will be the last expansion pack for Oblivion.
Speaking to 360 Gamer Magazine, Bethesda's Peter Hines stated; "Work pretty much started on Shivering Isles once Oblivion was done. We started looking at what we wanted to do, where we wanted to set it, all that stuff. It pretty much started last March. Shivering Isles is our last big thing: it's our first and last expansion for Oblivion."

Does this mean that the team has turned their attention to The Elder Scrolls V?