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(Author here) The Dell P2515Q I have has both DisplayPort and mDP2 in and out (for chaining).

As does the Dell 4K P2715Q.

I have to admit, my assumption for the monitor having both sizes of the display port (vs both being full sized DP) and including a DP-> mDp cable were so that the monitor worked out of the box no matter what type of port the source computer had. All possible combinations are satisfied.

Do the new MacBook pros support display port chaining now?

Older Macbook Pros also supported chining, but not the OS. It's working under Windows.

I have an Asus mg279q with both a DP and a miniDP input. The provided cable is a DP to miniDP, so you can plug most devices with a single cable (just reverse it).

I guess other monitors from the same line have miniDP inputs too.

My Philips bdm4065uc has both DP and mDP.