KLM has Al Reem and AL Dhabi listed as partner lounges.
Priority Pass hasthe same above plus the Diamond Lounge.
Is the VIP Diamond Lounge on the external public side of the airport / before security and immigration?
It's a shame the new Abu Dhabi airport isn't yet complete and open, as it would be interesting to see what the lounges would be like.
I'll probably use the Al Dhabi lounge, though you have got me thinking about the Diamond lounge :-)