Announced in America by the Valvoline (oil) company, is a competition for the Transformers Movie, in which the grand prize is a trip to the premiere of the TF5 movie (somewhere in America), and the first 5,000 drawn will win an exclusive toy called Valvotron. The alt-mode hasn't been shown yet, but it looks like it might turn into a Valvoline oil bottle, based on the moulding on the right upper-arm.
The competition closes May 22nd, to give enough time to draw a winner for the grand prize (for the movie screening), and it should mean that the toys should be out before the movie too.
(I'm confused by the fine-print that says that no purchase is necessary to enter... but the only way to enter is by uploading a copy of your *purchased* receipt... )