Yes dts only on JP3. Can anyone confirm if JP3 still comes with the offer for the 4th disk and box/case? If so, you can buy JP1 and JP2 in separate dts versions like I did and then send in for the 4th disk and box using the coupon that is inside the JP3 dvd.
As far as getting the dts versions of all 3 films in a boxset, I bought the dts versions of both JP1, JP2 and JP3 at local b&m's. The disk for JP3 came with a mail in offer for the box and the 4th disk.