Perhaps a poll is in order? According to the PDGA approved date, the following discs were released in 2013. I removed all the discs no on throws (sorry, Ching, Gateway [drivers], Salient, UB, etc...maybe next year) for simplicity. Just to tweak you MVP fan boys, I was tempted to remove their discs from the list as well.
Note that the Tern is not included; it was approved December 2012.
The Roc3 is not included in the PDGA approved discs list, by the way. Underworld and Tarsus were approved late 2012 and are not included either. However, Westside's "AIR" are approved separately, so technically they are part of 2013. Legacy did not release any new discs this year. All Prodigy discs were approved in 2013. A "D5" is approved, but I've never heard of or seen one. Discraft only released the Crank and the Ace Race disc is not included since it is not PDGA approved. Did I miss any?
DGA Breaker
Discmania MD3
Discmania P3
Discraft Crank
Dynamic Discs Renegade
Dynamic Discs Suspect
Dynamic Discs Truth
Dynamic Discs Verdict
Innova Atlas
Innova Nova
Innova Roc3
Latitude 64 Fury
Latitude 64 Mace
Latitude 64 Stiletto
Millenium Mortar
Millenium Omega Soft Big Bead
Millenium Tank
MVP Shock
MVP Tangent
MVP Tensor
Prodigy D1
Prodigy D2
Prodigy D3
Prodigy D4
Prodigy D5
Prodigy F1
Prodigy F2
Prodigy F3
Prodigy F7
Prodigy M1
Prodigy M2
Prodigy M3
Prodigy M4
Prodigy PA1
Prodigy PA2
Prodigy PA3
Vibram O-lace
Vibram Unlace
Giant VIP Air
Stag VIP Air
Sword VIP Air
Warship VIP Air