It's hard to say, all we have now are a bunch of unconfirmed rumours and leaks that may or may not be accurate. Supposedly AMD is going to be announcing the new Ryzen chips at CES in January, but retail launch likely won't be until March or April, and who knows what availability will look like for those first couple of months.
If you need a computer now, then the 8700k is still a very good choice for high refresh gaming. If you're willing to wait another 3-5 months and stick with whatever it is you have, then we're close enough to launch that it may be worth waiting assuming you're not just stuck with some Chromebook that can barely browse the internet or something like that.