I wonder how the screen aspect ratio will be dealt with? Maybe a border with powerup/score information a la Raiden? I know some people would be enthused if it displays at a 90 degree tilt requiring the TV to be rotated to simulate the arcade experience, but the casual player in me would prefer the Raiden method
In my setup I have a monitor permanent on it's side for the many "vertical" games the Ps1/Ps2/Dreamcast has to offer.
So I wouldn't mind if the TATE mode would be present in the game, in fact it would be great.