If it ended up being a fresh, entertaining game would you still be disappointed it isn't an RPG? The original game wasn't exactly a traditional RPG as it was by any measure so I don't think falling into a specific genre matters much for them.
Quite frankly, yes. I have no real interest in FPS games which this is shaping up to be. The original was not a traditional RPG, no. But that's what made it so memorable for me. Honestly I think it was easily a decade ahead of its time because if you compare the systems used in PE to that of Fallout 3's VATS combat they look remarkably similar minus the whole SPECIAL system to customize your main character.
I don't mind Hybrids so long as they are heavier on the RPG emphasis than the other genre/s fused in with them. That's part of the reason I disliked PE2 is because they chopped out a bit more of the RPG elements in exchange for something that felt more like Survival Horror due to the tank like controls and real time main attacks.
So far between the screen shots and demos I've seen of this game it looks greatly like there are little to no RPG elements within the gameplay system. Even the control scheme is screaming "This is a FPS title." Unless for some reason the in-battle menu will be linked to the Start/Select buttons...which will be a nightmare in itself.
Honestly if this game was named anything else with any other main character I wouldn't have a problem with it. But because it's a "Parasite Eve" game which is supposed to be an RPG series...it bugs me, endlessly. I thought SquareEnix learned the last time what happens when you take an RPG series and tack on FPS gameplay as the major style; it blows chunks. (I'm looking at you Dirge of Cerberus.)