according to what rumor and source report?
Don't have actual links at the moment but here is what we know for sure:
1) Schiller himself confirmed that a new "Pro Display" will be releasing alongside the new modular Mac Pro in 2018-2019
2) There are a couple leakers in the mac pro section here, one of them talked about how he saw the screen in person when visiting Apple HQ and guestimated the size to be 32-40".
3) There was a photo (i think I saw on reddit) of a thin silver screen in a testing facility at Apple HQ, the same size as mentioned above, with additional information from the poster that it was an OLED screen and one of the prototypes for what Schiller described as the new "Pro Display"
So all of it adds up to a new Pro Display releasing in 2018-2019, 32-40" OLED, and probably multiple thousands of dollars.