Read the full article here on Road.cc
From January 2010 any bike used in road, time trial, cyclo-cross or track competiton has to be available to purchase.
This is what the regulations say: "It must be marketed (i.e. available for sale on the market) or marketable (i.e. available for sale directly from the manufacturer, by subscription or through an alternative distribution network). Prototypes and the use of equipment specially designed for a particular athlete, event or performance is prohibited. 'Special design' means a bicycle with a "technical added value when compared with other equipment."
At a stroke this would take out a fair chunk of the bikes and equipment currently being used in the pro road races and time trials – even those that meet the UCI's technical rules. Much of what is being raced now is the prototype of next year's, or even the year after's, production bike.
The upshot of this is that if manufacturers can't test new designs under race conditions there isn't much point of coming up with new designs - and race proven technology ends up being used on more than just race bikes.
There would be numerous unintended consequnces too - one of which ironically might be that aero bikes get much more aero… but more on that later.
The intended consequences of the new regs are not just aimed at the road pro's bikes: unless they start selling them in Halford's some time soon, Team GB's track bikes will be illegal come January 1.