From a press release, in which the National LGBTQ Task Force—Be You asserts the military ban on trans people ends in July:
This final remnant of Don’t Ask, Don’t Tell will now be put to rest. This decision is a great victory for the many trans people who have served and sacrificed in the military over the years. They also served in fear of being discharged from the service for simply being who they are. Thankfully this now will change. We look forward to hearing more implementation details.—Victoria Rodríguez-Roldán, J.D., Director, Trans/Gender Non-Conforming Justice Project, National LGBTQ Task Force
According to various news sources, the ban's end could be announced as early as July 1 by Defense Secretary Ash Carter.