Since there is no mention from Toyota about a 2027 Grand Highlander, the dealerships have indicated it is dead and that would be on par with the released information where the 2027 Highlander is equal in length with a longer wheelbase than the Grand Highlander.
The Highlander EV has a longer wheelbase, contributing to its larger interior dimensions. The Highlander EV is designed to be a spacious and comfortable vehicle, with the ability to accommodate up to eight passengers, including adults in the third row. The Grand Highlander, on the other hand, offers more cargo capacity and a more traditional SUV design, making it suitable for those who prefer a larger vehicle with more space for cargo than passengers. Per Toyota press release.
I would not be surprised to see them produce the Grand Highlander for 2026 and kill it since no 2027 model has been announced. This lets the 2027 Highlander EV take over since it is a 3 row EV with adults in the third row unlike the current Grand Highlander that is kids only in the 3rd row.
Kia EV9 and Hyundai Ioniq 9 are clearly direct competitors for this. Yet with the Toyota Name, I expect many will make the jump to the Highlander EV.