Word is Diamond lounge access will only be available in 2018 for those that have 25k tier or more. There had been talking at my local casino that it would be like that there but my friend just sent me a screenshot of 2018 benefits showing that it looks to be system wide for 2018
At local casino, word also is its like AC in that you can get in for $10 in comps but it's free for those are 25k tier plus.