So to start with we will be given the ability to implement
actionable notifications and Glances. This is what I believe
we are getting with the SDK release this month.
It will only be later next year that full apps will be possible.
It is not a stretch to think that later next year is code for
WWDC next June. Likely along with WatchOS (or whatever they call
it) version 2.0. There is a delightful symmetry with the history
of iPhone OS, where we didn’t get a full SDK until 2.0 (though I’m
sure people will similarly jailbreak to get a head-start).