it's probably been said already, but I'd LOVE to see features such as:
- polyphonic tracks (think drums taking up just one channel and/or polyphonic synths and pads)
- multrtrack bounce arrangment to card - pretty self explanatory i guess
- pattern chaining using external gear
- metronome and count-in to record
- mono sampling
- ability to choose sound quality (32khz/12 is very welcome) thus extending the record buffer.
if i get this, i'm selling all my other equipment and quitting my dayjob