Hi from Australia.
Can confirm a single spoon, just got a brand new Davis Pro 2 from Davis Australia. After receiving it I sent an email to Davis support asking about the new single spoon set up thinking there was something wrong after seeing all the pictures of the original seesaw arrangement on the DP 2's.
I was told by Davis it's new. Apparently, Davis think it is more accurate than the the double spoon/seesaw setup. Furthermore, in the manual I got, it actually shows a single spoon not the seesaw arrangement.
Hope it works, but given I'm in fairly dry part of Australia I might not get to test it much. So probably wont matter!!!.