So much I know is it not a specific tower project, more a vision to redesign the "Dreispitz" quarter of Basel with a lot of new buildings. I think, Herzog and de Meuron has done some considerations how could look the quarter in some years.
Part of this project should be some towers, skyscrapers. But I dont know details about this buildings. But how I said, it s just a vision, without any warranty for a realization. But if it would be realized how it is planned, then I think, Basel would receive some kind of scyscraper "cluster" .
See also the left top corner of this picture
If you understand german, maybe this site can give you more informations
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