The longer PV should be up soon. Their twitter said they are working on getting it out. Which is good since the chapter comes to theaters in two and a half weeks. We will probably also get a 9-10 minunte preview of episode 15 the week before the chapter comes out (the same week the show starts on TV).
The list of performers for Yamato is growing.
http://yamato2199.net/tv_allstars/index.html (still 12 to go?)