I'd rather wait for Emgo to do a review. These early reviews don't give clear instructions how it transforms. But there's already Wotafa's review and his' pretty clear visually even if its in Japanese.

 

I speak english

 

Found two review, one from Ben's collectables

And one from John Garringer

 

EDIT: Uploaded a fixed version

 

Just magnificent, really impressed by the size in hand!

 

I like Megatron here.