Aufitt - are you refering to the YZF-R250 that Yamaha has (supposedly) been testing for a few years? Many forums are referring to this bike as the YZF-R4. Yes - the R-125 is a beauty, but it is quite a bit more expensive than the CBR125R in the U.K. Then again - I don't mind paying for quality and lighter weight (I still think the CBR250R weighs too much). If Yamaha built a YZF-R4 based on the R-125 chassis, using the WR250R/X single (some dynos show this powerplant producing 25-27 rear-wheel stock hp) and keeping the weight down to around 300 lbs - I would probably have to have another bike in my stable. Imagine that - 75 lbs less, and similar or better rear-wheel hp to a Ninja 250R.
Mike
Yes, Yamaha will blow the market away when its released, all be it probably like most yamahas more expensive, but you pay for quality

Hope its a single cylinder from the WR.
The R-125 was realeased here 2 yrs ago, nice running gear, bodywork and frame, but nobody bought it as it was 7k (same price as a Ninja 250 at the time , the cbrABS is $6k, the whoflung is -$6k), the crappy Megelli is $5k (looks are decieving)
Now they have released a very poor cousin of it the R-15 made in India and its $4k, its like the cbr125, very low spec.