Yup I noticed no articulation/expression mapping which sucks. I also noticed it doesn't say anywhere in the tech specs about it being 64-bit. I also noticed it seems to be very geared towards guitarists at the moment and for Mainstage 2 live stuff.
I see lots of new features but none of which would make me upgrade unfortunately. I would be interested however in seeing how the notation is holding up now. I am really tired of spending money/using Sibelius just to create a score of my works. Would prefer to use one application for all.
Obviously when it's officially in a lot more peoples hands and being used, we may see some benefits that I am missing at the moment. I am sure someone will see the value in the upgrade. I would just assume see my Logic 8 be updated. Logic is also falling terribly behind as the midi editor choice. I wouldn't any longer call it the king for midi.