Things are lot more complicated than that. One can't just use the current exhange rate to figure what a car will cost when it enters a new market. My that logic, a Ford Focus would cost around $25,000 in the US, which simply isn't the case. Car prices in a given country are based on several factors. Most obvious is that they need to be competitive in their sector. Also, there are more subtle factors. Transportation and tariffs on imports, for instance. Different VAT rates, although these usually aren't listed in the MSRP. Also, each company has administrative operations in each country where they sell cars. These people need to be paid to maintain the standard of living for someone in their position in that country. Also, even though most of the profits head back to the worldwide headquarters, taxes still need to be paid on income in the country where the cars were sold. Factors determining the final cut that the dealer makes vary from market to market, and change the final MSRP selected for the vehicle. Finally, there are the more intangible differences of brand image in different countries. Case in point: Audi is seen as more upscale in the US than in Europe and the A3 can command more of a premium over its rivals in the States. Additionally, in order to keep the upscale image, they may offer it with more standard features than accross the pond. Also, don't forget just how power hungry the US is. In order to stay competitive, the 3.2 will probably be the base engine, at least when sales start, further driving up the price. The end result is that this car may well seel in the US at the sterling to dollar exchange rate, but that doens't mean that most do.
ps - if it looks anything like those renderings, I want one, even though I would have much more use for the Sportback.