GP 2013 R2 is due any time and one thing folks will have to think about is UPGRADING WEB CLIENT
An important point from the article:
“At this point in time you do not have to upgrade the Web Client when you upgrade the Rich Client (Desktop Client) however we do always recommend being on the latest and greatest in regards to these releases since new features are added and previous issues are fixed.”
So you don’t have to do everything at once which is a huge plus!