Put it like this. Would you upgrade your 6700k to a 6800k?
If the answer is yes then go for it. Personally I have not had a four core rig in years. Mainly because (and loads of people never notice it) Microsoft added very good 8+ core support in Windows 8 (loads of people didn't even switch so would not have noticed) and multi tasking (again no one ever talks about this) is just so much better with more cores.
And you will load them and use them during desktop use, too. I have watched mine and the more apps and windows I have open the more the CPU seems to work harder.
Personally I would wait and see for now. It's the 8 core you want. Would you upgrade to a 5960x? I shouldn't even really need to ask that question
See what the entry level 8 core is all about dude.