Im not sure how the production team can top all the cameos that have come so far throughout the entire run of our show. When you look back, you see cameo appearances ranging from the simple (Rick Fox) to the unbelievable (half the cast of Star Trek: TNG, Leonard Nimoy, AND Stephen Hawking)! Where do they go from here? Its really unclear, but you can be sure as Sheldons bowels move by 8:30am every morning that the cameos will keep coming. Who would you like to see? Me personally, Id go for bringing both Spocks together onscreen, or Captains Kirk and Picard to keep this trend of outstanding cameos going. However you look at it, the anticipation of this 6th season of The Big Bang Theory is as climactic as it gets. The show is riding high as the entire cast continues to push the envelopes of their respective characters on the shoulders of some really great writing.