Something just occurred to me and because it's not an actual leak I don't think there's anything preventing me from spilling my guts here:
So far, we've had Rizzo from MT (or rather the MT era), Pepe from MT is in S5, Clifford from MT is in S6, and Johnny Fiamma from MT is in S7. Yet we know there's an MT character in S8. Who is left? Since we have Johnny we know we'll have a Sal at some point. Who is there after Sal? Bill the Bubble Guy? Took me five minutes just to think of him! Also he disappeared after the show. Same with Seymour the Elephant. Andy and Randy Pig? That's a two-pack and probably an unprofitable one as the characters were met with more annoyance than love. The only one I character I can think of from MT that could be made with the exception of Sal is... Big Mean Carl. He has some recognizability factor, but again, he hasn't been seen following the show.
Only the MT characters that have already been announced plus Sal have continued beyond the short-lived MT. There are no more MT characters that the public will latch on to, says I. Just Rizzo, Pepe, Clifford, Johnny and Sal. Ergo, I think that since we know there's an MT character in Series 8, and after Johnny there is only Sal left from MT to be a marketable figure, after giving you my logic I hereby offer the conjecture that Sal is the Series 8 MT figure.
LMK how my logic sounds and/or if I've overlooked something.
David "Gorgon Heap" Ebersole