Remember when I found out one can load Maschine 3 VST inside Maschine 2? Someone over at gearspace found out that if you rename Maschine plugins so that you remove the spaces from the filenames (ie. "maschine 3.vst" becomes "maschine3.vst" and so on), you can open both Maschine 2 or Maschine 3 inside each other! You can load up as many plugin instances inside each other as you want, this allows you to use several Maschine controllers on a single computer, while each controller has their own project/playhead/seq/etc
This allows you to still use your old Maschine controller with Maschine 2, while using Maschine 3 as a plugin inside M2, and vice versa. Dragging and dropping audio and MIDI also seems to work, to a degree at least. So you can stem export & bounce in place on M3 running as a plugin in M2, drag and drop the audio back into M2, and so on.. Or you can open several projects within Maschine instances for live performance.. lots of possibities!
Just thought I should share this info over here as well, since NI forums is where the idea originally came from.. This is probably not intentional functionality of Maschine, it is possible that future versions of the software might not work like this anymore, but it works right now (according to some users on gearspace at least, havent tested myself)