HTC sent out invite on Friday, August 13th, for an upcoming launch event the company holding on September 15: "come see what HTC has dreamt up 15 September in London". The event timing is significant as Microsoft plans to launch Windows Phone 7 in October. With that, it's possible that HTC may unveil their first Windows Phone 7 device.
Pictures of a pre-production HTC Mozart leaked earlier this month, fueling speculation this is the companies first Windows Phone 7 device. There's also talk of HTC introducing a new Android based tablet or a new Android phone - the Ace (HTC Desire HD).