I never claimed Japan would be more important in the coming gen. All I said was basically the UK means little because the winner of UK from last gen came in last. Wii won Japan and the gen, so i would say Japan is more important.
No, both markets are equally sized, just cause the Wii sold most in Japan and also worldwide it does not mean, that japan is suddenly more important. In fact looking at the data we have available, we see that the home console software sales have consistently been higher in the UK then in Japan for the last couple years. So yeah I'd argue that the UK is a more important market than Japan is nowadays.