From what I recall, the original concept art showed the attraction having a lift hill, and that the tunnel launch stayed the same.
The original coaster also included what seemed to be of a helluvalot more scenery, along with a section that resembled more of a western series of buildings at the east-side entrance of TSL.
It also seemed from I think WDWNT, that they indicated the Saucer attraction would've been of the theme that's in Shanghai, of Woody's Round-up. I could be wrong about that though.
Oh no, I meant the Monsters Inc coaster