Time for some copypasta!
New screens, and with them new information for this thread about the subweapons.
Stumbled upon some new screens via Amazon jp
Looks like Alucard will have the power to transform into wolf, bat, and mist, and also be able to stop time(I think that's an hour glass).
I see Trevor's familiar light and dark magic, familiar from Gabriel's in the first game, and boomerang and.. a ball?? for subweapons.
Simon's got a... Sypha thing (whatever that means...), axe, grenade, and... I still don't know what that last thing is.
Someone replied to me saying all the subweapons had been revealed, but didn't bother to fill me in on what that thing is. Someone who knows these things should speak up. If it's not here, it shouldn't be expected to be common knowledge.