Alucard has really evolved as a character since Draculas Curse into Symphony of the Night and so on. Since its a remake and we all see who Alucard is now, I think he should use his sword, maybe do upgrades with him from short sword, long sword, to Alucard Sword and have the fireballs as a sub weapon. His melee attacks could match the same speed as a Trevors until its upgraded to Alucard sword and then become a little bit faster. With that said, I dont think his attack power should be surpassed Trevors whip attacks but to balance it out since he gets a faster speed in attacks, it should take at least one or two more hits to take down an enemy than it would be for Trevor. His bat form should still be available like it was in Draculas Curse in the same button combination.
Just my opinion but either way man, Im really looking forward to this game!