Originally, the update had been planned for late October so it appears there is just a slight delay as Microsoft works out some kinks and continues developing the update.
Reportedly, Microsoft will simply name the update "Windows 10 November Update" or drop the name/identity completely.
Unfortunately for Windows 10 fans, there don't appear to be any killer features with Threshold 2 but the first major update, codename Redstone, will bring a universal messaging app and Edge extensions.
Source:
Winbeta
Written by: Andre Yoskowitz @ 4 Sep 2015 22:45