Dimand Real Estate Development, the company that Goumenos is working with to build the new Toumba, have a page on their web site concerning the new PAOK stadium. The page includes some pictures of the designs.
If you ask me we are better off with the present Toumba considering the poor design, small capacity (30,000), and mainly the fact that PAOK will not own the new Toumba for 50 years. Also if this goes as Goumenos is plannig, he will never leave the club.
Check out the page here:
http://www.dimand.gr/en/paok.htm