I'm starting to really like the idea of Maul=Grievous, and for the reveal to be given at the end of Dooku's meeting with Sidious on Coruscant Ep II...But for the bacta tank to just be off to the side of the hangar seems a bit strange; to me it'd make sense for this new Sith weapon to be constructed in the same room Vader was created. It could go something like this: (Sidious' lair, Coruscant) "I have good news for you, my lord. War has begun." "Excellent...." Cut to darkened operation room. Door opens to reveal the silhouetted figures of Dooku and Sidious striding toward the camera to gaze up, their faces lit by an eerie glow. "....Everything is going as planned." Shift to their view to see medical droids surrounding the half completed General...at this point, it'd be nice to hear what seems to be Maul's leitmotif in TPM, the whispered chant, "korah rahtahmah"

Well, that's my imaginations take on it, at least. Nothing too drastic, but perhaps a little less subtle than, "hey, look behind them!"