This DX Lost Driver is same with what kamen rider Skull has in Begin’s Night movie. Along with it picture of a new gaiamemory and silhouette of 3rd rider of W series. That memory is Eternal memory with unknown power and no more information about it. As seen above kamen rider Eternal shares same design as kamen rider Glaive (and G3 as rumour said). Looks like Eternal will appear in next movie of W.
This role will be played by Mitsuru Matsuoka (SOPHIA) as Daido Katsumi, leader of terrorist group NEVER. Hmm his face is quite serious. You can see his group members as Luna dopant, Izumi Kyosui (Sudo Genki) and Heat dopant, Habara Reika (Yashiro Minase) in source link below. Seriously, Heat is “heat” ^o^