Being as we didn't get a new Beatmania for the PS3/360, I don't have any expectations for next gen. It's such a shame. IIDX has crazy fans that don't even blink at spending hundreds of dollars on the controller alone. Take a look at what PS2 Empress is selling for on ebay, it's absolutely nuts.
But yeah, imagine having a home version with the potential to have every mix available on one giant song list, all with the latest interface. I'd LOVE that.