Seems like the logical time to introduce a 25th Anniversary Mac of some sort would be during the Super Bowl, exactly 25 years after the original Mac made its debut in Ridley Scott's commercial.
I am lazy, just pic my idea in the current Mac Pro. Don't change the body, maybe make it a little smaller if possible. But different logic board, with 4x Xeon Quads.
Well, with today being the day, you can disregard. I just heard somewhere there would be another event 2 weeks after macworld, i guess it never happened...