Got a copy of the book at PAX East this week-end and read it like on a trance on the flight back to France

Great book IMHO, and a great way to end the SR4 era. I like how it closes most of the current metaplots while giving a taste of what SR5 is going to be about.
I think I was only slightly disappointed by the way the duel between Ghostwalker and Harlequin ended. Not because it was badly written or anything of the sort, but mostly because I was all "oh my ghost, what's going to happen next?!" and it kinda ended with a big "To be continued". Oh well

Still hoping for that "Harlequin's Revenge" campaign in SR5 :p (or maybe it shall rather be "Harlequin's Redemption" ?)
Very intrigued by what's going on with FastJack and the other victims of the whole "digital body snatchers" thing. Should provide a cool and very creepy storyline in SR5 (and a healthy dose of paranoia to the Sixth World

All in all, it was not as apocalyptic/crazy/holy sh*t than System Failure was, but I don't mind, because while I enjoyed it the end of SR3 was a bit over-the-top.