Since no one's brought it up yet....
Maybe part of the reason they chose AOTC Yoda as the "big face" on the PT blu-ray is because they've now replaced the TPM puppet with the (ironically much closer-looking to the TESB/ROTJ puppet) digital model?
Also, while I'm on the subject:
If LFL ever put out some sort of "ultimate edition" blu-ray of TPM that included the theatrical cut (perhaps late next year for the blu-ray 3D, hint-hint if you're reading this, LFL) I would seriously consider paying good money for it. Regardless of our opinions on the movie, it had one of the highest U.S. box office grosses of the 90's (second only to Titanic for that entire decade, if I'm not mistaken) and the original version deserves to be preserved if for no other reason than history.
By the way, I'll take this opportunity to reiterate my desire for ultimate sets of the OT that include not only the OOT but the '97 OT as well. Doesn't ANH SE still have the highest U.S. January gross of all time? Talk about box office!