Also, Intel should be releasing Coffee Lake (8th Gen Core) some time between now and the end of 2017. But, as mentioned a couple posts above, details are intentionally kept scarce and we won't know much until Intel decides it's time for us to know.
If you do anything that would substantially benefit from a huge amount of threads and you have the money to spend, waiting is a no-brainer. If you don't work with highly-threaded workloads, it *might* be worth waiting potentially 2-3 months for Coffee Lake just for the improved IPC. But that's up to you.