Here is one for evanh...
https://www.eetasia.com/news/article/18033003-mram-on-the-rise?utm_source=EETI Article Alert&utm_medium=Email&utm_campaign=2018-03-30
“Five years ago, we thought we’d have to fight at 40 nm against flash, which is not the case today,” he said. “Today, the story’s different. The three main foundries have adopted MRAM as a non-volatile memory solution for nodes starting at 28 mm and below, and that there would be no flash available for these nodes. That was good news for us.”
Looks like a 28nm P3 (P4?) would use MRAM, instead of Flash..
There is still Flash activity at 28nm, so there is some overlap to the claim..
"16 MB of built-in flash memory, six 400 MHz CPU cores and deliver up to 9600 MIPS"