Yep - simple really, I've ordered one and asked the importers at the show what the 'detail changes' were for 2013.....
The Repsols have a unique number near the headstock; I was told that the new ones have 2012 (for 2013) marked on them wheras the older models have 2011........
Swear to God that's how the conversation went.
I stand to be enlightened but, hey - why fix what 'aint broke?