About Irelia: The Blade Dancer

Just watching her trailer, she looks like she might be the best rework of Season 8 so far (still too early to say she's the best. Have to see what Akali & Nunu have to offer). Her appearance wasn't drastically overhauled like Swain or Galio, but instead modernized like Warwick & Gangplank. Her gameplay looks like it was cleaned up quite Abit & she looks satisfying to play.

I do have a few questions to ask about her update. 1.) During development, was the Conqueror Keystone used in her play testing? If so, how did she perform with it? 2.) What roles do you think she'll be able to play? 3.) Which keystone (s) do you think will be optimal/Viable on her?