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

The UCI (Union Cycliste Internationale) just added a Practical Guide to Implementing the Technical Regulations for Bicycles to their website. What does this mean for you? They are hoping this will solve all your questions regarding frame dimensions, wheel sizes, aero profile shapes and the appropriate positions for aero bars.
So, now that this is out, we are assuming that the UCI is hoping that we can all:

stop producing bikes that are too aero
stop tilting your aero bars upward
stop placing your saddles too far forward
stop riding bikes that fit if you are very short or very tall
stop our bitching and just obey the rules

Let’s not dissapoint them. Download your copy, read the rules and OBEY!

UCI has released final dates for teams to comply with Article 1.3.024 regarding accessories used in time trials such as the handlebars, seat post and cranks.

1 July 2009 – Aero Handlebars
1 January 2010 – Other components

More details to follow in June.

Recent web articles:
The official announcement from Union Cycliste International
Detailed article from BikeRumor on the affects to manufacturers