According to the developer sources, the PS4 core can do 1.84 teraflops, while the Xbox 720 is at 1.23 teraflops which is about 50% faster, also note that the main memory of the Xbox 720 will be 8GB according to some trusted sources, the PS4 will has half of that with 4GB of RAM, the source also announce that the Xbox 720 will be equipped with a Blu-ray reader.
Comparison in graph:
To make things official you'll have to wait only two months, in March both company will make the first official presentation of the products.
Some Playstation 4 expected technical graphics results in real-time:
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