During one of the concerts for Tackey's current solo tour he talked about reuniting with Tsubasa to release something as a duo. No dates or anything were given but he did say that it would be soon and that they would also be having a concert together.
Tokyohive article. (English)
Honestly I had just about given up about Tackey & Tsubasa as there had been no word of the two getting back together since the initial hints about this late last year. I'm sure this update, while vague, will make the duo's fans happy though.