Pets..would not really work well within Fast and Furious Supercharged. Not because there wouldn't be space. In-fact, quite the opposite if it's the Hollywood version.
A realistic, expectation to me, is a Jaws 2.0 of Supercharged. One that revamps elements of the attraction, while still retaining most of the base form. One thing that I would wonder, is if they could add practical cars with musion within them, into the 360 arena. And have the cars alongside the buses. Most of the major changes that are needed, are things like a revised ending that'd add more than just a corridor. And also gutting the Party scene for something new. Honestly, if I was Universal, I'd look into a mishmash of F&F proper, and Hobbs and Shaw.