Without any of that confirmed, I do believe the gist of that is right, that Wanda is going to have a big role going forward as one of the last, most important pre-Thanos members of the MCU.

Nightmare reigns as a villain who captures heroes in dreams, while Wanda Maximoff's demonic powers surprise hardcore Marvel fans. Marvel Comics spans a vast amount of mythological creatures ...

(Well, except Rocket). While those guys "died" due to Thanos' gauntlet-assisted click, other characters kicked the bucket for real, including Loki, Gamora, and Wanda's partner Vision (Paul Bettany).

As for Vision, he was first dissected by SWORD after Thanos killed him, but then was…recreated by Wanda in Westview, and after the events of that series, existing as “White Vision.” ...