You can't find pictures because the car was released yesterday.
In the presentation the middle row seats inclined forward. On the Model X webpage it says the back row seats fold flat. You could definitely fit a whitewater kayak in; a downriver kayak would be tougher. Perhaps you need the configuration with two seats in the second row (instead of three) -- that should be enough room to fit a kayak between. That said, I imagine the second row seats will fold down.
In the presentation the middle row seats inclined forward. On the Model X webpage it says the back row seats fold flat. You could definitely fit a whitewater kayak in; a downriver kayak would be tougher. Perhaps you need the configuration with two seats in the second row (instead of three) -- that should be enough room to fit a kayak between. That said, I imagine the second row seats will fold down.
But you could just put it on the roof :)