http://secure1.white-wolf.com/graduateyourgame/While I can't say anything fair in comparison of the two systems, this strikes me as the sort of marketing strategy to expect from a vindictive seven year old bully. Trade in your D&D PHB and get the Exalted PHB and a side order of massive condescension.
How lovely. Fortunately, this is pretty likely to backfire horribly on them.
There must be some interested or else they wouldn't have expanded it to the UK.
Plus of course all those copies of 3.5 are going to be gathering dust soon when everyone rushes out to get 4.0 (assuming they're not already hooked on Exalted ;) )
Heck, I'd try it, now if only I owned a 3.5 players guide to trade in