Tokyo Marui have added photos of their URG-I (aka URG-I Sopmod Block 3) to their website with a release date of the 18th of February noted on their cover image.
Marui list this as having a 14 inch upper, M LOK rail system, recoil system, ambidextrous controls, folding sights, 82 round magazine (stamped metal) and a removable muzzle (14mm reverse thread). You can see the rest on the translated page here.
