If you can wait then it is always worth the wait, just look at Haswell Refresh and Skylake CPU, the price is almost identical (within few bucks difference only), but Skylake packs more performance than Haswell (10% - 15% in average)

Some people might not care about the generation and performance, they will just grab whatever the market is offering, but some people prefer to play the waiting game and board the latest tech train ASAP when it reaches them, so it is really up to your personal decision whether to wait or not, if you are in need of a new PC then you can just get Skylake for now because next gen desktop CPU is only scheduled to arrive in Jan 2017 (according to many sources).