Yes but kaby lake is new so we must not get outdated equipment I'm my new Macbook's! I would honestly wait for Canonlake TBH. Intel has moved beyond the tic tock method and now is just optimizing after every die shrink. If we have waited basically a year and a half on an upgrade no harm in waiting 2 years and a quarter for Canonlake?
To be honest the only things in skylake worth waiting for is the better graphics with 64mb eDRAM cache in the 28w chips found in the 13 inch rMBP. Other than that it won't make a blind it of difference to most users.
Yeah if you are looking at performance increases then a better GPU in the 15 inch and TB3 if you want to run an external 5k screen, but that has very little to do with chip performance, other than that you might as well wait for canonlake.
Of course thinner, lighter, better designed machines with better screens, better wifi and Bluetooth may be worth an upgrade too but again the Intel CPU used makes no real difference other than the ease with which these things are incorporated into the design.
By all means I am keeping my 2013 rMBP until canonlake there is just no compelling reason for me to update and nothing on the Windows side is worthy of my money either.