Good point, Ben, but given that the RS4 is likely to sell in smaller volumes than the S4 and is only a variant of the A4 rather than a fundamentally new model, there is no reason why it cannot appear here so soon after launch. Anyway, that's what Audi UK tells me. Moreover, the UK is I think one of the strongest Audi markets outside Germany, in particular for the RS6 and TT. So it makes sense to get the RS4 here soon.
I've ordered the Avant. RS2s, RS4s and RS6S really need to be estate cars, otherwise they lose their Q-car subtlety! That said, the B7 A4 is quite a bit more aggressive than I expected.