I wouldn’t be surprised to see Toyota/Lexus ditch the V6 in all transverse applications. They’ve already done it in the Sienna, which really shocked me, and I think they will ditch the V6 in the RX and Highlander as well.
The only exception to that might be the Grand Highlander and TX, but I don’t know what V6 might be used in that. It won’t be the GR, and that’s part of what makes me think we will see a smaller displacement TT V6 for the TX, Grand Highlander, Tacoma, Prado, GX, and 4Runner.