Indeed some great fixes - particular the one about the Piano Roll correctly displaying selected mid regions.
That had been driving me nuts for a very long time, and I thought it was me just being 'thick' about how the Windows functionality worked.
Speaking of which since L7, the Windows functionally of Logic has never been the same and after several years now of L8 and L9 I still really miss the simple way in which you could build up a series of interlinked, nicely sized, display windows and LOCK them in a floating position.
This is still IMHO the very best possible way to combine Midi and Score Editing: you have your main Arrange open with a couple of small windows, Score Editor and Piano Roll, sized very long and flat and thin, linked up so you can see the notes at the Playhead at all times. ( This would also be useful in using new tools like Flex View when using it to correct the timing of notes in audio, and line up midi notes when extracting parts and making scores from audio).
Apart from the disastrous loss of lockable Floating Windows, since L8 onwards and the useless new method of splitting the screen right across the bottom where you are stuck with that layout...
... the capacity in L7 and earlier to very accurately size and shape any Locked Floating Window to any part of the Screen was a huge plus in workflow which has been lost.
I rest my case
PS that said it is absolutely to be celebrated that Apple are releasing such detailed updates which suggests they are taking Logic Pro's long term future seriously
Mac Pro1,1 OSX10.5.8 3GHz, 5GB RAM, Saffire Pro 40 L9 + Macbook Pro with L9.1.8 & OSX 10.8.2