User blog comment:Jimeee/Skyrim 1.9 beta update adds Legendary difficulty and raises level cap (Updated Apr 8th)/@comment-74.134.148.245-20130315235052

Bethesda said before Skyrim was released that they would have fewer DLCs than they had in Fallout 3. That had five DLCs, so I think Redguard will be the last one.