As of today they have said they are not changing the release date -
From Entertainment Weekly -
Lucasfilm has been attempting to reshuffle the schedule to accommodate the 71-year-old actor’s absence, which has proved especially challenging since Han Solo is a major part of the film. Despite rumors that Ford will be sidelined until the end of the year, Lucasfilm now says he will be back much sooner than those long-range predictions. “Harrison is doing well and is looking forward to returning to the set soon,” the studio said in a statement.
Though the release date remains unchanged, but shooting will be halted for two-weeks in August as a result of the altered scheduled. The film is still on schedule to finish lensing in the fall.