Not much to go on at this point. A developer called Otherside Entertainment just posted this teaser on their website: http://www.othersidetease.com/strawberry.php
It would seem that Otherside Entertainment has many of the original members of the System Shock team on board, enough to claim that this could be a true sequel to System Shock 2. Furthermore, Otherside Entertainment completed a successful Kickstarter for Underworld Ascent, a spiritual successor to the Ultima games. So, there might be a System Shock 3 Kickstarter it the near future.
Personally, I'm interested to see what comes of this announcement. The System Shock universe was always such an interesting setting. I look forward to seeing what Otherside Entertainment can achieve with the power of modern hardware.
Plus, on another note - 2015 continues to be a great year for the revival of old IPs! We still have the best part of December left, let's see a few more IPs resurrected before the year is out and continue this trend into 2016.