My bracket is just like Gene's...wonder why?

It's a bit of a chore getting that thing to lift off the bracket...need two strong backs for sure. And the DW to unplug the cords while you hold it in place. Not sure if we could presume yours is the same bracket...maybe different? But all brackets typically need to be lifted up to get 'em out. Some will have lock-in mechanisms so they don't come off by themselves....ours does not have this feature.
The next thing you need to decide is if the new TV's mounting holes will fit the bracket. What TV are you installing in it's place? I had to drill out new holes in my mounting plate to fit it to the new Sony I installed. Each TV will be different, so verify this in advance. When I replaced the BR TV, I did even more mods to the home-made bracket TS used. But everything is doable...just may need a little planning and re-engineering.
One last thing...be sure you have enough room around the perimeter of the new set to allow ample air flow so you don't overheat the TV. Heat is the #1 thing that kills these new TV's off prematurely. I put a small computer fan behind mine, but need to figure a better way to get the heat out of there.