We briefly talked about this in another thread that it was coming. Well... he's there!
A friend of mine is currently in London and he told me he popped in a Disney Store there today and saw a lot of Duffy stuff. I just went on the UK Disney Store site and it's gone live. Right now they're only offering the 17" bears and a few costumes that you can get at the US parks.
There is one BRAND NEW item I'd never seen before they have available:
Mickey Mouse With Duffy 44cm Soft Toy | Duffy | Disney Store
This is actually quite cute! I'm going to try to talk/beg my friend into picking one up for me.