According to engadget mobile, HTC is going to throw a party on the 24th of June, beginning at 11:30AM in London, although there is no word as to why the party is being held.
We can presume HTC will undoubtedly unveil some HTC goodness upon the mobile phone arena, and as you might remember, HTC unveiled their HTC Touch Diamond as a similar event just over a year ago.
Presumable HTC will unveil the HTC Hero with its customisable Android user interface; however not knowing any detail as HTC are keeping tight lipped it is difficult to guess at this stage