Daniel Suarez is top of my list to replace Stephenson. His books aren't great literature, and not as great as Stephenson when he was at his best but they are good page turners for near future tech.
Daemon, Freedom, Kill Decision, Influx.
http://www.amazon.com/Influx-Daniel-Suarez-ebook/dp/B00DMCPO...
[1] http://www.amazon.com/Influx-Daniel-Suarez/dp/0525953183
-- TL;DR Synopsis --
Secret government agency with hyper-advanced technology (AI, fusion, gravity control, etc.) keeps scientific advances from the general public and gradually trickles them out once they feel they can control the response properly.