Okay, so Wisp is in-game and I'm forcing myself to not purchase her as well because I have not been playing a lot of Warframe because of my work. Delayed gratification at its best. To be honest though ,she looks amazing floating in the air, and she even becomes ethereal when airborne!

She has 4 abilities plus the passive of becoming ethereal/invisible mid-air, which you can check out in this review video of the Devstream from YouTube:

Here's the Warframe Devstream 126: Wisp Ability Breakdown & Gameplay:

To get the Wisp Warframe, again you'll either need to purchase her with Platinum or just beat the new boss called the Ropalolyst.

Now, DE has teased 2 new male frames! One big guy and one speedy guy. To be honest, we already have a big guy and a speedy guy in-game (Rhino and Volt). Well, Rhino is the buff big guy, and this new brown Warframe is simply a big guy (ate too much kind); however Volt is already fast as he is, so this new speedy frame is kind of a duplicate - but we don't know his kit yet so who are we to judge, right?