Looks like if you bet that the first trailer for Transformers: Age of Extinction would be attached to 300: Rise of the Empire. Good thing I didn't take that bet as I figured an R-rated movie wouldn't stand a chance of being the debut movie. This has not been officially confirmed but ET has just released a teaser (below) for the TF4 report that will air on Tuesday with "all new scenes". Since ET is part of the promotional arm of Hollywood, they wouldn't air this unless the plan is to release the first theatrical trailer either that day or a few days later.

Speaking of that trailer, the Paramount Pictures International YouTube channel has started their pre-prep by creating a new playlist with the first listing labeled as "Transformers: Age of Extinction -- Teaser Trailer". Don't bother trying to find it as the video is not yet posted for the public and the playlist is apparently on visible on some mobile devices. The 2 minute 22 second length of the PG rated trailer doesn't really suggest "teaser" so slightly confusing but the label is really semantics anyway.