I don't own a Blu-Ray player and don't have an intent to get one anytime soon (I'd buy a PS3 first anyway), but this is kind of cool... I've always imagined the Lucasfilm archives being just jam packed with cut footage. I've always wanted to see the Wampa investigation, and supposedly the Battle of Hoth was a bit longer (and Veers' Death scene was filmed). I'd dig seeing that, and the wounded-sequence with the Rebels in the trenches getting desperate.
I also would love seeing the shots filmed for ROTJ's space battle and Endor battle that were cut... They were supposedly equally elaborate, filmed, and then just axed.