Imai will be participating in Hotei's 30th anniversary album, All Time Super Guest. So far, other "super guests" on the album include Nagai Seiichi (from the band Soutaisei Riron), the incurably fecund Miyavi, Imai Miki (Hotei's wife, doncha know), and Kobukuro (who I thought were incapable of making any other music than soulful ballads, but maybe Hotei will help them prove me wrong.) Collaborators previously announced include Dragon Ash and Cornelius, among others.
Imai will perform on the track "GUITARHYTM," alongside Nagai Seiichi, Miyavi, and Hotei himself. I guess they never said "too many guitarists spoil the band," so, stay tuned. No release date for the album has yet been listed, but you can check for details here.