No upgrade for me (an IHG Platinum) at CP Adelaide until I asked for one after pointing out that their own website states that Platinums get "Complimentary room upgrades (subject to availability)". IHG Rewards | Crowne Plaza Adelaide There seemed to be plenty of availability.
It was only then that I was reluctantly given a 1 category upgrade to a junior suite. And was told it's "just this once" !
The rest of my stay was fine.