It's only a 55 inch screen. When viewing from the couch, say 5 feet away, and seated perfectly centered, the edge of the screen is only about 4.6 inches further away than the center. Hardly worth all the effort to "correct" for this difference. (Math: 55 inch diagonal means a 48 inch screen width. Distance to edge of screen can be calculated using Pythagorean theorem: sqrt(5^2 + 2^2) = 5.385 feet. Difference of .385 feet, or 4.62 inches)
Now, what is the curvature of the screen? It has to assume an ideal viewing distance before the ideal curve can be determined. Is there a single viewing distance that all owners of this TV will agree on? Not to mention a 55 inch screen is a major downgrade for anyone with that kind of money to spend. Given all these reasons, hard to see why they would bother to do this.