Landmark Theater’s is remodeling the Shattuck, adding “Landmark’s exclusive Screening Lounge™ auditoriums and other upscale amenities.” I suspect that’s a trademarked name for what other theater chains have been doing for years. I found a description of another “Screening Lounge” theater on Landmark’s site; it should give you an idea of what it means.
Basically, it appears to mean plush chairs, love seats, and so on. They’re also adding “a full-service bar and an upgraded and expanded concession area.”
I think the Parkway is creating a trend.