actoys.net has revealed an image that COULD be Masterpiece Megatron in robot mode. It is unclear whether it is official or a fan made item.
Forum member Nemesis Scourge has received a reply from Fan2Fan about the release of MP Megatron.
Not at this time, the sales at Takara-Tomy are reluctant to release info on releases more than 3 months away, I guess they want to keep us focus on their new releases. Anyway I am pretty sure they will be releasing it considering the amount of hype it has stirred. Price and details still unknown.