I would actually like to see that Bumblebee Mustang concept used, if they did episode 6. I mean, TLK and the Bumblebee movie already established Bumblebee as vehicles other than a Camaro. In my opinion the Camaro gimmick has kind of overstayed it's welcome at this point (for me, more so than the mute gimmick). I'd really like to see him have a wider variety of vehicle modes in the future.

 

Like it or not Camaro is synonyms with bee as Optimus is with flames...
I think if they did tf6 they might give him the 2016 beetle as car mode

 

I wouldn't really say Optimus is synonymous with flames. Outside of the Bay movies (and a couple minor incarnations, like Laser Optimus) the character generally doesn't have flames.

I do think Bumblebee is becoming synonymous with a Camaro (or maybe sports cars in general), because almost every modern version of the character turns into a Camaro-looking vehicle. I wouldn't say that's necessarily a bad thing, but I do hope we see Bumblebee evolve away from that in the future. Again, I just think it's run it's course, and I think we're already starting to see a shift away from it.

 

Which is why a 3016 beetle would work. if and I mean if, they did tf6 maybe he starts off as a Camaro before ending as a 2016 beetle
As for prime I meant it for the general audience
To my wife at least prime comes with those awkward flames lol