I think I'd prefer to stick with the orchestra. Gives each and every moment that cinematic feel.
Like Wes's final charge against Ransiks forces and his impending doom. The gravity of his situation was that much more apparent with the orchestra as oppose to a band rocking out.
Then again... Beast Wars had a little of both. I wouldn't mind that at all.
But since this is going to the production team behind Hercules, I'm expecting them to stick with the orchestra sound.