I'm here live at the event Twitter is holding at their headquarters in San Francisco to show off -- well, something. A part of it is inline pictures and videos in the main Twitter stream, but it's anyone's guess what else they have up their sleeves. One hint may be this egg that on screen right now. The agenda states there will be an intro by co-founder Biz Stone, an announcement by CEO Evan Williams, then a Q&A session with Williams, head of product Jason Goldman, and Kevin Cheng who is on the product team.