Per Cupertino's press release:
The 13-inch MacBook Pro with Retina display features dual-core Intel Core i5 processors up to 2.8 GHz with Turbo Boost speeds up to 3.3 GHz and 8GB of memory, up from 4GB in the entry-level notebook. The 13-inch model can also be configured with faster dual-core Intel Core i7 processors up to 3.0 GHz with Turbo Boost speeds up to 3.5 GHz. The top-of-the-line 15-inch MacBook Pro with Retina display has a new, lower starting price of $2,499. The 15-inch model features faster quad-core Intel Core i7 processors up to 2.5 GHz with Turbo Boost speeds up to 3.7 GHz, 16GB of memory, up from 8GB in the entry-level notebook, and can be configured with quad-core Intel Core i7 processors up to 2.8 GHz with Turbo Boost speeds up to 4.0 GHz I don't normally link to news of minor product revisions, but today's updates resonate with me for one simple reason: my MacBook is really showing its age. I think more and more about upgrading to a 13-inch Retina MacBook Pro --- with 16GB of RAM --- because not only would it be a stellar upgrade but also the high resolution display would make my eyes happy and make Yosemite look great. Maybe I'll ask Santa for one this Christmas.