According to the folks in the UK, the UCI has stated they will begin regular enforcement of the saddle tilt rule as well as the new bottle size and placement rule starting March 1st. Issues related to saddle tilt popped up this year with random enforcement of a rarely discussed rule. The bottle issue is new and sounds like an attempt to keep riders using bottles for hydration and not for aerodynamic enhancement.

Read more at BikeBiz: UCI to enforce saddle tilt rule in 2012

And more at velonation.com