Autosport suggest that the Jones brothers will be back with their McLaren, rather than their Merc (nice to have the choice!
), and that Fortec might turn out for a few rounds, although their main programme is Blancpain Sprint.
They also suggest there's a second Nissan to come from JRM, shared by 'an experienced GT driver and a rookie'...
There's not been much news of the GT4 Toyota- IIRC GPRM had it (or at least a show car?) on display in the paddock at Donington last year