I believe that the bandit is on it's very last legs and as they spool down production, it's possible Suzuki does not have the capability to supply the large US market anymore. I also think CA emissions may be at work here also.
I have sat on a 2006 1200 S Bandit and can tell you that other than some new gauges & plastic, this thing is still a Bandit. And interesting enough, the Bandit is not really a huge seller in Canada. The UK yes, Canada no. It's either cruisers or sport bikes here.
I think you guys will probably get the GSR while we will be stuck burning up the Bandit parts bin for a couple of years.
I did read on one of the Suzuki sites that someone somewhere in the world has seen an entirely new Busa engine casting, but could not explain why the new format was done. More CC's? or Modifications to place in a GSR frame?
I think 2007 could be interesting for Suzuki.