Roland has put together a fairly cool rig, with bit of new tech to spice up a bit of the old. Roland Wireless Connect, a USB-WiFi adapter that can be connected with many of Roland's instruments, will allow for all kinds of interesting interaction on your iPhone.
They've got a video that does a good job of demonstrates the iPhone sending a song to a synth, and then a synth sending its audio back to the iPhone. I'm a little impressed that Roland can pull this off with their older hardware!
An additional image on their site labeled "Product-Hero" seems to hint at further developments, as Roland expands their keytar range to include Pulse Rifles, from the movie Aliens. I'm glad to see Roland continues to try to make the keytar sexy!