I Googled it (like I'm sure lots of others here have) and loved reading on all the Disney fan sites about the speculations. The top specs have been a release of Song of the South (RU = Uncle Remus and something about 23 x 2 = 46 - the release date was 1946.)
Another biggie is the release of 23 animated classics going to Blu Ray.
Another one is something about a private Disney fan club to join.
I also just Googled RU23 and came up with some RU23 Eagle Project where some guy was recreating a scale model of a space ship - looks alot like something from Star Wars. Wonder if it has something to do with some new space movie or something.
I love the speculation. Anyone got any new ideas?
Pete's rant about this on wdwinfo.com is hilarious as well. He says IT BETTER BE BIG! Amen, Pete, amen.