For DOTM release you can add a new case type on top of a steelcase and alt cover with a Transforming Megatron case, at least in Germany. No idea how widespread these alt cases will be in the other countries but if previous history is a guide usually they become store exclusives somewhere in other regions. Speaking of other regions, it seems Germany is getting the movie on November 10th and the UK on November 28th. Also below is the HD version of the US release commercial thanks to JosephNCali.
Shout Factory has announced the December 6th release of Transformers: Prime - Darkness Rising on DVD. The mini-series was the initial five episodes that launched the series last October. Their press release can be found here. The retail price is $14.97 but Amazon currently has it for pre-order at $10.49. Personally I am just going to wait until a season box set comes out.