Following the revelations by Edward Snowden, Stross announced that there would be no third book in the planned trilogy. "Halting State wasn't intended to be predictive when I started writing it in 2006. Trouble is, about the only parts that haven't happened yet are Scottish Independence and the use of actual quantum computers for cracking public key encryption (and there's a big fat question mark over the latter—what else are the NSA up to?)."
https://en.wikipedia.org/wiki/Rule_34_(novel)#Sequel_cancell...
Following the revelations by Edward Snowden, Stross announced that there would be no third book in the planned trilogy. "Halting State wasn't intended to be predictive when I started writing it in 2006. Trouble is, about the only parts that haven't happened yet are Scottish Independence and the use of actual quantum computers for cracking public key encryption (and there's a big fat question mark over the latter—what else are the NSA up to?)."