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Starting from the right, you have the Radeon HD 7970 GHz Edition, Radeon HD 7950 with Boost, Radeon HD 7870, Radeon HD 7770, and Radeon HD 7750. The 8570 and 8670 are new, and basically the successor to the Radeon HD 6570 and 6670. The two on the far left are the Radeon HD 5450 and 6450.
Now, that's the list of cards for OEMs. Nvidia has sometimes released an OEM version of a card and also a "normal" version of the card which is a different card with the same name. See the GeForce GTX 660 for an example of this. But it's not looking like there will be much new in the Radeon HD 8000 series, which is all right, as apart from a new entry-level gaming card that is much cheaper than the 7750, it's not obvious what AMD really could or should have introduced.