You may have noticed that Harrison Ford has been extremely tight-lipped about his involvement in Star Wars: Episode VII. Market Saw claim this is because the actor is still in negotiations to return as Han Solo for the first time since 1983's Star Wars: Episode VI - Return of the Jedi. Both of the new Indiana Jones movies are included as stipulations in his Star Wars contract, which means he will only come back if he is allowed to also reprise his role as Dr. Henry Jones Jr. in not one, but two new movies. They will likely be shot fairly close together, due to the actor's age.
Indiana Jones 5 has not been officially announced or confirmed by Disney, but the studio acquired the rights to the franchise in December.
Harrison Ford has openly expressed a greater interest in doing Indiana Jones 5 over Star Wars: Episode VII, and it seems this may be the bargaining chip Disney and LucasFilm are using to lure him back into the seat of the Millinium Falcon.
At this time, though heavily rumored, Harrison Ford has still not been confirmed as an official cast member of Star Wars: Episode VII.