Initially, there are no native apps beyond Apple's own. Third-party 'apps' on Apple Watch will effectively be extensions of iPhone apps. But that doesn't mean what you'll get will be limiting. If the apps we already know are in progress — 21 of which are covered in this feature — are anything to go by, Apple Watch owners will be in for a treat from day one.
When Watchkit was first released last year to developers, I was hesitant about how limiting it was. It seems like they have managed to come up with some really creative uses for the watch, and I'm definitely going to be purchasing one on day 1.