Updating kids' playroom

Excuse the mess! Picture 1 shows a cabinet that will be removed and picture 2 is a view from the kitchen. We are having new floors put in soon and would like to update our boys' play space. Our boys are ages 9 and 11, so they are less into toys and more into electronics and a media/game room. This room is also right off our garage so it typically becomes a drop off spot for shoes, coats, backpacks, etc. The corner fireplace is also being taken out, and I'm hoping to get a wall mounted one instead. I'd appreciate ideas as far as types of furniture and placement.