Apple hasn’t updated it Mac pro range of desktop computers for quite some time, the last revision came in July of 20102, and now it would appear that evidence has been discovered in OS X 10.7.3 Beta which may have revealed a new Apple Mac Pro is on the way.
A reference in OS X 10.7.3 Beta relating to AMD’s new 28nm desktop graphics cards, codenamed Tahiti, which are due to be released in January of 2012, has been discovered, and this could mean that Apple has some new Mac Pro’s in the works.
The new Tahiti series should end up with Radeon HD 7xxx branding and as it will come in XT and PRO flavours. It’s kind of safe to assume that Radeon HD 7970, codename Tahiti XT will be the fastest single chip card from AMD while the Radeon HD 7950 will be codename for the Tahiti PRO product.
Of course Apple could be building in support for existing Mac Pros and these new graphics cards, although Mac Rumors points out that Apple normally introduces support for a new graphics card at the same time as they release a new product.
Source Mac Rumors