I'll throw a name into the ring i think we should keep an eye on: Philipp Schobesberger.
Its been a while since i thought a Rapid player might be good enough for the premier league but I think this guy might be. Very fast, direct winger/forward in the mould of Sadio Mane. He's quicker than Mane; definitely in the Walker/Yedlin pace category. He's improving all the time after breaking into the Rapid side.
Scored again on the weekend against Admira with a typical finish. He really hads an ability with his pace, control and quickness of feet to beat people in tight situations and manufacture shooting chances.
Dortmind signed Kampl, Leipzig signed Sabitzer, and I'd wager that Schobesberger is better than both. I think he could be just what we need: lightning, eye for goal, good control, fearless.
You can check out his goal here:
http://www.skrapid.at/195768.html?play=328121 (skip to 2:20 for the goal - although he is involved the whole way through)
Just after the goal he cuts in from the other side of the box and smashes a great effort against the bar.
These sort of goals and attacking play are pretty typical for him (recently anyway).
Just putting it out there