I spoke with my banker today. JPMR will carry over the United Club benefits (unwritten just like the Palladium) and Priority Pass Select benefits along with 2 additional guests (don't need to be authorized users).
Palladium card is to be migrated over to JPMR "in September".
One open question is, will I be able to cancel the Palladium and apply for the JPMR to get the 100k signup points?