We at Pocket-lint first brought you word of HTC's HD3 back in March, following a leak of specs and images into the webiverse.

And now we're hearing rumours that the Windows Phone 7 device could be the big announcement at HTC's mystery event in London on 15 September, which Pocket-lint has, of course, been invited to.

If you're not familiar with the HD3, then allow us to fill you in:

Reports suggest an absolute beast of a handset to follow up 2009's HTC HD2 (which ran Windows Mobile 6.5, sadly).

We're expecting a 4.5-inch AMOLED display with a HD resolution of 1280 x 800. Running Windows Phone 7, the phone is said to be powered by a whopping dual-core 1.5GHz ARM-based chip, with 1GB of RAM on board.

There's allegedly 32GB of built-in storage (which can be doubled with a microSD) as well as Wi-Fi, Bluetooth and HDMI-out.

The camera is reported to be an 8-megapixel one, with dual LED flash, and it should be capable of capturing HD videos as well.

In short - it sounds like one heck of a device, and will surely create some hysteria for the new Microsoft OS if it performs as it should.

As well as the HD3 being announced, we are hoping that HTC uses the event to give us more info on the Chrome OS tablet that it has supposedly got up its sleeve.

Either way, we'll be bringing you all the news live from the event - so make sure you check back on Pocket-lint on the 15 September. And all the days in between as well, mind.