A LVRJ article on the new trend (?) of sunlight being let into casinos:
Of course, Encore made a significant play for this and I think very successfully - parts of the casino are indeed flooded with light.
The author mentions CityCenter as an extension of this. My first impression walking through ARIA was certainly not that I needed sunblock. The casino is directly up against the porte-cochere glass doors in several places and light certainly spills in at the edges... maybe it's because the color scheme is mostly earth tones but it 'felt' dark to me.
There are certainly wonderful spots at ARIA, such as the main registration desk, the Harmon entrance and the entire promenade level, that are very well lit.
I hope this is indeed a trend that continues... Personally, I'd love to see a joint where the entire casino floor ceiling to be a skylight. Could be an amazing design feature, no?