Just saw at TFW that this one has a concept thread starting from late 2014. Somehow missed this entirely.

http://www.tfw2005.com/boards/transf...-megatron.html

Here's a pic from TFSource. Prototype image and can't see the head sculpt too well but looks pretty good overall though the fusion cannon doesn't look right. Seems like something more fitting to Perceptor than Megs.