I can only hope that this edition finally allows the priority system and progressive costs for advancement die an ignominious death and they are never seen again.
Hrm. The Rigger Dossier intrigues me.
Possible that 6E will see Rigger rules early in the cycle for once?
Over before it starts, how sad.
No, TMs are the new Riggers.
I don't understand the last two comments? 
It used to be that the Rigger book was the last of the extended core books, signalling the end of the edition. SR4 had no Rigger book, except an April's Fools joke related to this. SR5 it came out sooner, SR6 they're joking it's immediately ending because there's a Rigger thing coming out.

In truth it's simply a fifth character to add to the 4 in the Beginner Box.
Meanwhile, Technomancers now have to wait the longest for a detailed book.