I’ve been monitoring the App Store Review Guidelines for when rules specifically addressing the Apple Watch would appear. Today we got our first new rule specifically forbidding a certain type of Watch app.
10.7 Watch Apps whose primary function is telling time will be rejected
For now it looks like the only ‘clock’ apps that are going to be permitted on the Watch are those provided by the built-in clock faces.
I’ll continue to keep my eye on this page for future guideline updates.