I personally hope we dont see a Grot chariot, but that is just me. I hate chariots, leave them for the old world xD.
Im fine if they stay souped, but like you said i'd want to see a rebranding of the battletome, it cant be gloomspite gitz if you want to have what, 4 (3 not including troggs) major factions inside it. Just make sure they have a nice roster like ironjawz to build a force out of, without having to lean into troops from moonclan.
What chaffs me most is honestly, is Kruleboyz have the exact kinda aesthetic that would have worked for grots but they made them orks haha. In another timeline, they downsized just a tad, made them hobgrots, and im playing that army no questions