The new policy returned oneworld to industry standard re interlining across tickets/PNRs. Carriers can chose to do more then that should they decide to.

UL, JL and MH will still check through across tickets.
BA and QR will not check through, period. Even to themselves.
CX will check through to other CX/KA flights.
QF and AA will check through to their own flights, will check through to other oneworld provided one ticket is an award.