The only revisions I’ve seen on Toyota pistons has been the larger oil openings for the oil control rings on their four cylinders that had the campaign for oil consumption. But the 2Gr-FE engine, I haven’t seen anything. They use the oil sprayer under the piston, but I think they’ve always had that...and I believe the piston has a Teflon coating on the sides, but I don’t think that’s new or anything.
Of course just because I haven’t seen or read anything in the internet about the 2GR-FE means nothing, they probably are fine for 0w20-10w30, like everyone has said.