Which phones would that be then? HTC says "global variants" of the, , and the . I've contacted HTC to see exactly which ones we'll see in Blighty, and will update the story if I hear back.
The note on the HTC Facebook page says upgrades will be coming "in the next few months" so we may be in for a bit of a wait. It won't turn your old blower into a brand new HTC One though, as the company notes that "some features enabled by the new HTC One hardware will not be available in the software update." Blast.
The standout feature of Sense 5 is Blinkfeed -- a homescreen mosaic of news stories, photos, and social updates that you flick through, kind of like Flipboard. Click one, and it'll come up in full-screen mode, so you can read the story/see the picture clearer/see more of the status update.
To find out more about Sense 5, check out our hands-on preview of the.
We'll have to wait and see exactly which features make it to older phones, and which stay exclusive to the HTC One. But still, it's good of the company to port its UI to those not wanting to pony up big money for its latest handset. HTC has said the One will cost about the same as the One X did when that was new, so you're looking at about £500 SIM-free, or £30-£35 a month on contract.