It's at least the Relics. My last 50 dinged right after 1.4 so it's been a while. I can't remember if there was anything past that.
Ah. Maybe it was changed in 1.4. My last was just before that.
Would be nice if they put this stuff in the patch notes since they made a late addition to add the reduced WH cost and removal of BM, so now I don't trust them to have either changed MK2 and not said, or if they didn't touch it.