Ethero 2 will run on iPhone 3GS, iPhone 4, iPhone 4S and iPad 2, and is currently waiting for approval. We’ll let you know once it’s available!
They have also released a video showing what to expect in the v2.04 update of Cascadr for iPad, which is the ability to save sequences to one of eight slots. It’s possible to switch slots and tweak ‘on the fly’ while Cascadr is playing music. This now means it’s pretty easy to make a simple song with Cascadr now, albeit with some live dodging about!