Reports are surfacing that the elderly Harrison Ford will be returning as Han Solo in the upcoming Star Wars film. El Mayimbe of Latino Review says that his return is a sure-thing: "His deal is done, it's just a formality right now, they haven't really announced it yet."
We're still not sure that this is the case as the movie is still in its infancy, though there have been numerous other rumors that proved true. For instance, the rumor that J.J. Abrams would be the director proved true, so it is certainly possible this one will work out as well.
The source has been correct in other movie scoops before, as well, which lends some credence to this rumor. If the decision has already been made and a deal done, the announcement shouldn't be too far in the future. Worst case is we will know for sure when the movie comes out.