And now the 2015's are out. :-[
For me, the only attractive feature the 2015 has over the previous generation is the WP suspension. I'm not sold on the FBW throttle and associated maps, CC, etc. The system appears to be the same as used on the Triumph Explorer and it got a lukewarm reception at best by owners.
So... I bought a used 2013 800XC last week that had only 1767 miles on it!

I'm liking it alot. The upgrade/farkle list is fairly short: Better handguards, better skid plate, risers, and possibly a suspension upgrade in the form of Traxxion AK20 cartridges up front and a Penski rear shock, or the OEM '15 WP suspension front and rear which is a bolt in. The cost of either route on the suspension + the cost of the bike and other farkles is still
WAY under what a new XC sells for so I'm happy.