I am not familiar with this character, either, but Wikipedia tells me this:
Jones first appeared in Alias #1 (November 2001) as a former superheroine who became the owner and sole employee of Alias Private Investigations. She has since starred in two ongoing series (Alias and The Pulse), and became a member of the New Avengers alongside her husband Luke Cage during Marvel Comics' Heroic Age. At various points in her history, Jones has used the aliases Jewel, Knightress and Power Woman.
She doesn't come off as a particularly exciting character in the Marvel canon, but I'm excited to check out where they go with this series.