Prepare for another item squish. I did some calculations on how item level correlates to weapon dps. The result was surprisingly a rather static percentage increase per itemlevel of ~0.9344% in dps.
This leads to these future expansion dps'es: http://i.imgur.com/qMgGa3e.png
EXP7 will feature MOP levels of damage, just like we had 3.4k dps one-handers in Siege of Orgrimmar.