As explained on Sierra's website, pre-orders placed on Xbox One consoles will earn the torus-shaped Blood Count and the cupe-shaped Titan Box, the latter of which is exclusive to Xbox. In place of pre-orders on the Xbox 360, the extra stages will be given to anyone that purchases the game before 11:59 PST on December 2.
For PlayStation fans, the exclusive Symbolic stage will spawn enemies in shapes matching the four shapes used for the DualShock's buttons, as well as the triangular Secret Eye that's seen in the above image. However, pre-orders on PlayStation Network will only be available in the Americas.
PC, Mac and Linux users that pre-order through Steam will receive Secret Eye and Blood Count, and there appears to be no region-based restrictions on that offer. You shouldn't run out of targets if you decide to wait things out however, as GW3: Dimensions will still launch with more than 50 levels for single player.