The rumors continue to come little bits at a time, and as of right now, we do not know if the codex will hit next week, or if it will come the week after. From the hints in this White Dwarf, it looks like we wont see any book until week 3.
Please remember that these are rumors, and come from a good source.
via an anonymous source on Faeit 212
+Forgeworld on main site confirmed
+ Plastic HH confirmed
+All resin kits are to be getting a plastic upgrade before 2017
+This is one of the "Red weeks"
+More paint colors to come before the year is over
+the limited edition of the mechanicum codex will be limited only to 1010