And then there's the grunting :)...
Like a lot of artists, I just wonder if he's being a little too prolific with releases. I'm fond of the earlier stuff: Solo COncerts (Bremen - Lausanne - sp?), Koln Concert, Eyes of the Heart, etc.. His specialty is obviously improvisations but if the past is any indication it seems like its always hit or miss with Jarrett and it will continue to be that way.
Come to think of it, that probably says something about improvisation anyway. If the inspiration is lacking or even if its there you can't always capture it and make something beautiful from it. In essence, its a gamble.