Reports are coming in (via TUAW) that Apple has announced an invite-only event to be held next Tuesday at the Regent Street Apple Store. The invite is pretty cryptic, even for Apple, but like almost everyone else I'm presuming that the tagline "Mum is no longer the word" is hinting at a UK release for the iPhone.
Update: My main objection to the rumours that O2 were Apple's chosen partner for the iPhone in the UK seems to be disappearing as, despite having a perfectly good 3G network, they appear to be rolling out an EDGE network across the UK. That more or less both confirms that Apple are going to be the shipping a 2.5G iPhone in the UK, and that O2 is their chosen partner. There really isn't any other reason for O2 to do this...
Update: I'm going to be presenting in a conference during Apple's announcement, so if you want to follow along you'll have to make do with Engadget's live coverage.
Update: My comments on the release of the iPhone in the UK.