I just got a postcard in the mail about those on Friday. They look like they just changed the hub to carbon and shaved 30 grams. They're $100 more MSRP than the previous models as well.
I finally got my Topolino back from repairs. No charge for the repair and no idea from them what the failure was. I just need to get it taped up and reinstall the cassette and it'll be ready to go on my backup bike for the 508 next month.