The Hotel just sent me the below as I'm planning a stay in April thought it might be of some use for others.
Regarding your enquiry, please find below step of room upgrade for Royal Ambassador Member for your reference,
BluPort WingReserve
Upgrade to
Superior Room - Superior Suite (BluPort Wing) or Premier Room (Beach Wing)
Superior Studio - Resort Classic Suite (Beach Wing)
Superior Suite - Premier Suite (Beach Wing)
Beach WingReserve
Upgrade to
Resort Classic Room - Premier Pool Terrace
Premier Room - Resort Classic Suite
Premier Pool Terrace - Premier Suite
Resort Classic Suite - Premier Suite
Premier Suite / Club InterContinental Suite - No upgrade