Hello! I wonder if there have been any changes to the TV hardware since it was first released almost two years ago. I'm aware of the big software change to 2.0, and I'm aware that multiple HD sizes are available, but I've never heard of any subtle hardware changes. I'm thinking of things like graphics chipsets, CPU speed, memory, available ports... that sort of thing. Are the boxes shipping today identical to the ones shipped on day one? Thanks very much!