About UK (GBP) pricing ... the guys over at disposablemedia.blogspot.com got this info from their Microsoft insider (who also confirms the August 24 date):
* Core 179.99 GBP
* Premium 249.99 GBP
* Elite 299.99 GBP
We have seen the core price drop to match that of the Wii, so we should see more in the next few days!