a few/lots of the schumy team seem to be running a prototype/new chassis, Ali and has a brace at the back, that you mentioned.
I got a closer look at the MKGP as pitted next to a team member.
Looks good, and seemed to give a lot more space for electrics etc as no need for the normal top deck...
And being Ali, is very strong of course.
Will they put it into production?

Who knows................ well, Schumacher do lol.................