The Defenders will arrive this summer with The Punisher coming later in the year.
Daredevil Season 1 and 2, Jessica Jones Season 1, and Luke Cage Season 1 are now available on Netflix.
If both of those facts prove to be true, then it seems like Alexandra will fit in quite nicely with the other villains that The Defenders have crossed paths with already.
Hard to think of a more perfect person to bring that kind of presence to the Marvel Universe than Sigourney Weaver too.