Can I connect 2 monitors to my 2015 Macbook Pro Retina via 2x DisplayPort connections?
I found conflicting information about this subject, so for the sake of clarity for anyone asking the same question:


As per the comment @James left on @Bret's answer, the Mid 2015 MacBook Pro with Intel Iris graphics CANNOT drive two DisplayPort monitors simultaneously, so it is not possible to run two external 4K displays at 60Hz. This was tested on the 15" model with standard Mini DisplayPort to DisplayPort cables.
You can however run one 4K display at 60Hz through a DisplayPort and a second 4K display through the HDMI port at 30Hz.