There are many ways to treat the vortex and the raked wingtip is one. It is generally accepted that it is NOT the best treatment but it is one.
In the works now is a 'spiroid' It is a winglet that spirals up and is enclosed.
But for the real adventurer.. we have the Lockheed Ring Wing, a concept Lockheed looked at in the 80s. Of course, never built but you can see the -1011 lines in the artists concept. And no, this is not a photoshop creation.
