[Not certain if this is accurate] With the solar rails to the Tau system destroyed, the sentients are no longer able to come to our worlds. However, their rise still continues with Hunhow's coming. I'm very certain it will be a long campaign to take the fight to them and end the dark legacy of the Orokin.
Steve has been tinkering around with some things that may very well be the future of Warframe. [Not my video, and please pardon the yelling.]
In case you cannot be bothered,