"Races and Classes" has the following to say about the Monk.
"Through dedication and practice, monks become supreme martial artists, capable of great feats of speed and strength. What others accomplish with magic and steel, monks can do with only their bodies and minds."
also
"In battle, no one is faster or more agile than the monk"
"execute rapid manouvres that send his opponent flying, knock it to the ground or stun it into submission. A monks defences are also strong ... avoid attacks, and he can channel his ki to heal his own wounds."
"The monk class is still on the horizon"
"Since the monk relies upon mobility, the class will likely be a striker, putting down high damage with unarmed attacks".
Not much that you wouldn't guess from the existing monk, and no hints about 'when'.
I wonder if they will do a specifically 'orientally themed' book, like the 3.0e Oriental Adventures? I don't know how well received that was.