I think that the lightning bolt symbol either means a new thunderbolt version, or what I think is more likely is devices with an increased power limit. We already have 240W charging available (and it’s far from perfect, see here: A call on 240w adapter - #162 by Obasav)
But! I think with the fixes to the EC and other various components that control the power, there’s a bit of room to stretch its legs. Maybe HX series? Maybe they’ll put Strix Halo? I’m curious what they do though. If I recall correctly, both of those have fewer PCIe lanes, but I could be mistaken.