What will be Qiyana's main role?

Likely jungle with mid as a secondary position. But players will try her anywhere even in ranked...especially in ranked.

She is a jungler , but works for mid Playing her Top is a waste

100% jungler. Shell probably be too squish to pass the Renekton bar in top.

prob banned will be her main role

" Qiyana is the first solo-laning assassin to release since Zed, which was nearly seven years ago. The princess comes from Ixtal, a new region added to the game’s ever-growing world. " : riftherald.com [sg-ezreal]

Mid probably

She seems really good in the jungle as you get the most utility out of your w, she also has really good ganks such as: you can use rapotors to e into mid lane just like yasuo can.

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I could see her being top, mid or jungle.

Agreed! ^_^

She doesn't have built in healing. So, I doubt Jungle. Her kit's also not generally aoe (Except her Q), until her ult comes into it. I could see the damage spiking and a Tiamat build creating some jungle play, but I think she's generally going to be mid, given mid AD's roam, can actively pick up river Elements better than a jungler,

Her lane phase looks to be like somewhere between a Talon and a Zed.