The entire Internet seems to be guessing about what Twitter is going to unveil at their big event later this afternoon . Analytics, deeper Google integration, the killer business model? All fair guesses, but we've just heard from a source at least one of the things being announced tonight: inline pictures and videos on twitter.com. Such a feature would mimic functionality that some third-party Twitter clients have been doing for a while. The most notable of these may be Brizzly (this was one of their original key features) -- but they shouldn't be too upset about Twitter copying their feature now as they're in the process of being acquired by AOL . Given the backlash Twitter has gotten recently for rolling out features that third-party clients offer, our breaking of the Brizzly acquisition news would seem to be a bit of good timing for them.