PCWorld is showing that they plan to ship these ereader next Wednesday. I don't know if they are overly hopeful, but the website does show a ship date of 3 October. Other retailers are showing ship dates for October, with Currys showing 3 October and Folyes choosing to be vague and merely describe the release date as "early October". A number of B&N's other UK retail partners also have the Nook up for pre-order, but they don't show a date.
I've double checked with B&N, and they still don't have any definite info showing for the UK launch on the website. But the site does confirm the fact these ereaders are up for pre-order. The old nook.co.uk site also now redirects to UK.nook.com, and that is also new.
So it looks to me like the Nook Store will launch in the UK next week. Is anyone excited?