I'm looking forward to this. Just picked it up today. If the sampling features are as upgraded as they say, this could render an upgrade to full Ableton Live (from Live Intro) unnecessary. (I mean, I already have Kaivo and NI Komplete, and Omnisphere (enhanced with Luftrum & Plug In Guru), and stuff like that, which blows away the stuff in Ableton's more complete DAW versions. And Geist, with 64 pads per 8 engines, with Scene and Song modes, I mean, I'm not sure if it parallels or overtakes Ableton. I guess it depends on your use of external hardware and the purpose - be it performance with DJ'ing, or more of a compositional purpose (mine). With Geist you can use pre-existing MIDI and run multiple keyboards on different channels - control everything that way; and just use Ableton Intro for the audio warping.
I'm not sure if my purchase of Nerve about 6 months ago was very bright (Nerve doesn't allow actual groove functions, because it divides the beat up into a resolution that is much too course to be effective.