From what I can deduct from the manual, all Si's will come with the Bose sound system. However there will be two different Si models:
1. 9" touchscreen NO NAVI w/ the 7" half-digital cluster
2. 9" touchscreen WITH NAVI w/ the 10.2" fully digital cluster
I'm thinking the US won't get navigation...
Honda just updated the sedan owner's manual on their website with new Si details, including a preview of what it looks like, features and more. It now will come with an Individual Mode to customize engine (throttle response?) and steering individually which is interesting...