It seems they are stepping up their Diamond recognition...
I've got a booking in two weeks (Premium Room Redemption) and they already upgraded from KING DELUXE to KING PREMIER SUITE. Also, received an e-mail with the Diamond benefits, which include:
Complimentary Waldorf Astoria Lounge access, Lounge located on the 5th floor and available daily from 0700 to 2300hrs
Breakfast 0700-1100hrs
Afternoon Tea 1500-1700hrs
Cocktails 1700-2000hrs