IŽd really love to see a sourcebook/supplement (in this case, IŽd actually prefer one of those crunch/fluff chimeras

) about Heists, B&E, infiltration and exfiltration. Note that this would fit really well with the previous 2 suggestions: Rules for rigging buildings (a.k.a. the work of security spiders) and corp security in general. You could integrate all of that in a 2-part supplement: One part detailing security measures, Spiders and CorpSec strategies, one part detailing the ways and tools to break them and giving examples on famous heists.
Also, I severely missed the "darker paths" of augmentations, and transhumanism in 5th Edition - Cyberzombies, "Jarhead"-style Cyborgs, Cyberware addiction, Bunraku dolls, that kind of stuff. Maybe in the same vein, more about E-Ghosts (maybe even rules for (accidentally?) becoming one), "Brainhacking", VR indoctrination...