In the past I saw Itlead Stuido on Indigogo trying to raise money for these screens but now they are available for sale.
I saw them on this Youtube video where a guy is using the Photon also:
The key to the screen is the free software that allows you to layout the screen graphics and touch buttons with ease.
I just ordered a 5" version to test out for projects where power consumption does no need to be kept to a minimum. I use Sharp Memory displays when power consumption needs to be minimal.
You can get more info on the screens at: http://nextion.itead.cc/