ZDNet:

Prior to this upgrade the base version of the 13.3-inch MacBook Pro with Retina display featured a 2560-by-1600 resolution at 227 pixels per inch retina display, 2.4GHz dual-core Intel Core i5 CPU, 4GB of 1600MHz DDR3L RAM, and 128GB of PCIe-based flash storage, and it had a price tag of $1,299. For the same price this model now comes with a 2.6 GHz Intel Core i5 chip and 8GB of memory.

The base version of the beefier 15.4-inch with Retina display model came with a 2880-by-1800 resolution at 220 pixels per inch display, 2.0GHz quad-core Intel Core i7 CPU, 8GB of 1600MHz DDR3L RAM, and 256GB of PCIe-based flash storage, all of which would have set you back $1,999. Following the refresh this now comes with a 2.2GHz CPU and 16GB of RAM.

The price of the high-end MBPr has dropped from US$2,599 to US$2,499.