I got the exact same article, on a different site.
the trademark expires soon, but they could just extend it again. Apparently they've done it twice already.
True, the fact that they've extended it twice means that they have plans for it and imo that is the next expansion. I think they aren't officially declaring a use yet in an attempt to keep it more secret in the early stages of development...either that or they plan on putting out a small add on or 2 before Redguard. We can only guess at their plans but if it is the next expansion then we won't be seeing it for awhile as they still need to release dragonborn to PC....sadly ps3 players are still waiting for werwolves and vamps

unless there is more concrete evidence of it being a DLC becuase i doudt it as a Elder Scrolls Game already had the Name Redguard.
it was a Spin off calledThe Elder Scrolls Adventures: Redguard set just after Tiber Septim had taken over Hammerfell
Dragonborn revisited an expansion for morrowind so using the name Redguard again is not an issue for them