Welcome to the TV Tropes and Echo ChamberAlternate Reality Game.
On 17.09.2012 a message went out to the wiki from the mysterious "Mister Administrator". As has become clear, cracks have emerged in the Fourth Wall that separates fiction from reality. This has allowed fictional characters to slip through to our world. Some have been filmed on video camera, as chronicled by the Youtube channel of Average Joe, while others have engaged us in direct communications. Examples of the latter would be the Cheshire Cat and Hercule Poirot. The tropers have been busy solving riddles and uncovering clues to the nature of this event.
Newcomers should read up on the timeline, to be found here.
Original Post (edited): I'm slightly curious about the new announcement banner linking to this video. The same video is on the main page, as of 17.09.12, 23:00 GMT. The twitter account that the video links to seems to go back quite some time, and is no less vague. Any comment, or will things become more clear in the near future?