The rumors were true, and more. It's a slim phone with a big screen and a fast chip. It runs 4G LTE through 327 mobile operators in 155 countries. Specs are here and here.
It drops in the end of April. Available in "black mist and white frost." Not, lamentably, "sable drizzle."
The phone has a bunch of wow-factor features. It has simultaneous translation to and from nine languages. It's super-syncable, for sharing pictures, videos, and music. There's a group play feature that turns a group of phones into a stereo system, each phone broadcasting a different stereo band.
There's a dual camera that allows the shooter to appear in a small window in the video he/she is shooting. The phone tracks your eye movements for pausing films you stop watching midway. It scrolls by tilting. The phone reads texts to you.
And there's an elaborate setup for various health apps, allowing you to track calories, heartrate and more.