Unlisted Last Bastion Video.
*Edit:
Amomentincrime.com
2016/Oct/18 12pm pst. The countdown ends.
...Estableciendo conexión...
...Protocolo Sombra v1.95 iniciado...
...Transmisión finalizada - finalizando carga...
...Carga finalizada. Unidad Bastion E-54 comprometida...
...Terminando conexión...
<!-- v1.4.0.2.324?? -->
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This implies that the next patch from version 1.4.0.2.32374 will add new content to the game. No actionable items given in the overwatch arg. It also confirmed my Sombra ARG work on the Unlisted Last Bastion Video. It seems reasonable to assume that hack is a form of crowd control that sombra will have and that the next hero is either sombra or will be something that she can control.
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Update-
Sombra ARG is making massive progress after todays patch. Patch 1.4.0.2.324 is out. Some bastion morse was added to the game. Leads to a website. The website leads to a phone number with a message. The game detectives are decoding it now. (progress here) It appears that the news is that november 1st is the day of the dead when numerico will come online, thus that is the expected hero release date.