HTC has issued an invitation to its fans on Facebook, inviting them to “see what’s next” during a London event on September 1st. The company probably won’t unveil any new phones during a public event, but the IFA tradeshow in Berlin begins on the same day so we expect HTC will be making a number of announcements around the same time. We also have a few ideas of what could be in store. It’s possible that HTC will have its Prime and Ignite Windows Phone Mango devices on display. We also wouldn’t be surprised if there were more details on the Sensation’s successor, the HTC Ruby, which is supposed to pack a dual-core 1.4GHz processor, a qHD display and more. Maybe we’ll even see HTC’s latest tablet, the Puccini, which is expected to launch on AT&T later this year as the Jetstream.