He might just be waiting for OS4.
I wouldn't get my hopes up (but I did, argh), the guy who's making it is an Amithlon person, I'm not sure if he's even interested in OS4. :-(
Audio Evolution might be worth checking out too, if you're into hard disk recording. Though it doesn't sound like there are any plans for a sequencer in there any time soon, but as I understand it the plan is to connect it to Bars & Pipes and use its sequencer for MIDI and virtual instruments later on (maybe?). Maybe Davy Wentzler could correct me here if he reads it? I know he's around here sometimes.
Something like Cubase (not CueBass ;-) ) or Emagic's Logic or even Reason would be very nice to have on the miggy, but I don't see it happening any time soon.
Not Logic anyway, since Emagic have been bought by Apple and even ditched the Windows platform
I don't know about Cubase though, what's its status on the Atari? Is it still being developed? Maybe there is some hope there somewhere (way) down the road.
What I really want is virtual instruments (VSTi or something similar), there's an area where the Amiga is lacking. But it may be down to processor power, some of them are quite power hungry because they rely on the cpu to render the sounds as opposed to just playing a sample. Maybe there's hope with the AmigaOne.