It not like Hasbro and Takara haven't already given us four "inner robot included" options for us to pick from in the last five years, those being Siege, Netflix, Premium Finish, and Kingdom.
I'm skipping this Ultra Magnus as it's a lot of money for a character I already have several good toys of (unless he goes on super-double-secret-discount or something). But given that, in some continuities, UM is kind of a "Dread Pirate Roberts" sort of situation, I'm not opposed to having multiple versions of him. Sometimes he's only a big robot. Sometimes he has a slightly smaller robot inside of him. Sometimes he has a MUCH smaller robot inside of him. They're all just different iterations of Magnus.