The new 15in MacBook Pro may feature a Retina display and lose its optical drive for a thinner design but the new 13in MacBook Pro looks set to retain its SuperDrive, and remain at a lower resolution, if leaked photos are to be believed.

According to leaked photos of the new specs, the display resolution on the new 15in MacBook Pro will be 2,560 by 1,600 (the native resolution is currently 1,440 by 900). Photographed specs suggest that there will be no Retina display on the new 13in model, however, the screen resolution is still listed as 1,280 by 800.

The SuperDrive remains in the 13in model, but there is no mention of it in the specs for the 15in model. If either image is to be believed this could suggest that Apple may not remove the optical drive from the entry-level laptop, as expected, in a complete redesign of the range. It is thought that Apple may remodel the MacBook Pro and make it thinner, like the MacBook Air, by removing the little-used DVD drive. The leaked specifications for the 15in MacBook Pro suggests that it may redesign that model.

The new 15in MacBook Pro will feature a 2.6GHz quad-core i7 (presumably Ivy Bridge) processor. The graphics cards will be the AMD Radeon HD 7770M graphics and the Intel HD Graphics 4000, according to the photograph of specs that 9to5Mac claims they received.

The new 13in MacBook Pro will feature a 2.5GHz Intel Ivy Bridge processor and the Intel HD Graphics 400 GPU, according to the specs that appeared on Chinese site, Weiphone.

Both new laptops will feature Bluetooth 4.0 and USB 3.0, according to the photographs on the Chinese website and 9to5Mac. The images on both sites suggest that Thunderbolt and Firewire 800 also feature in both models.

The new laptops are expected to be announced at WWDC next week.