The ROKR excites me about as much as a colonoscopy.
As for the Hermoine, I bought the original P800 and thought it was a groundbreaking product. Then Sony proceeded to do virtually nothing with it, and the P900/910 updates added nothing truly exciting, nor did they correct some of the P800's little glitches and flaws. Anyway, the Hermoine feels like too little, too late. The Treo and various PocketPC models already have a ton of momentum, I don't think Sony can really counter that--at least in the States. (Plus, Sony's little thumbpad keyboard is really awkward to use).
I'm on the verge of finally getting a Sony W800....the phone that the ROKR should have been!