As best I can tell Intel kinda painted themselves into a corner with their 14nm+++ process. It produces really high quality parts (no surprise) but that also means that there is now an expectation of super high clocks on the intel side. That's not realistic however and I highly doubt their 10nm can currently match their 14nm+++ process on clocks (yet). It looks like Intel is thus focusing 10nm on areas where clocks more representative of a new node won't be an issue: server and mobile.

I'll be honest and say I'm very curious to see how intel tries to escape this trap they've set for themselves. Unless we see rapid gains in the 10nm process quality up into the 4.5+ GHz range I wouldn't expect to see 10nm desktop parts anytime soon.