Here is my take on this bikes 1st run. BMW is releasing "2014" model in March next year - 2013. So all of 2013, we will have 2014 model, then comes the following year - 2014, the bike will not become 2015, but remain the same. Hence, 2014 WC GS will remain as is for two years.
Few Small enhancements if we're required, won't happen till 2015!
Personally if I were to get it, it would this new 2014 model, no point waiting for two years for any minute fixes.