According to ANN: It’s a 2-hour special featuring Yui Aragaki as Akane Tendo, and Kento Kaku and Natsuna as the dual male/female sides of Ranma Saotome. That’s… pretty much it for now.
Honestly, I don’t know if I should be happy or not and I’m not even the biggest fan. I like watching Ranma simply because of the comedy/humor and the amazing cast. Will it work in live-action format though? Because… I don’t know.