"Will this work in the new MDX through its "slide forward" feature without removing the car seat?"
You can have access to the third row in the 2014 MDX if you have one child-safety seat installed in the second row, but not if two are installed.
Instead of two captain's chairs with walk-through space between them, the MDX's second row is a 60/40-split folding bench. Each side has a push-button release that lets you slide that side of the seat forward to climb into the third row. That means if you have a child-safety seat installed on the passenger side, you can access the third row from the driver's side and vice versa.
The second row has about 6 inches of forward-and-back travel, and the center portion has a folding armrest, but there is no walk-through provision to the third row.
You can learn more about the seating arrangements in our review here .
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