Apple added four Apple Watch guided tour videos to its web site: Welcome to Apple Watch, Messages, Faces, and Digital Touch.

Disabled placeholders for future videos include Phone Calls, Siri, Maps, Music, Apple Pay, Activity, and Workout. [Via iHeartApple2]

According to the Apple Store front page, Apple Watch pre-orders start on April 10th (this Friday) at 12:01 a.m. PDT. Which really means late Thursday night, just after midnight California time.