The first HD 6000 GPU to be released will be the Radeon HD 6700 series, codenamed Barts. The HD 6700 is scheduled for a release as early as October. As suggested by the nomenclature, the HD 6700 will directly replace the HD 5700 series.
The HD 6700 release will be followed up by Cayman in November, expected to be branded as the ATI Radeon HD 6800 series, replacing the current HD 5800 series.
The flagship will be Antilles, and branded as the ATI Radeon HD 6970. Antilles, as expected, will be a dual-GPU Cayman. While the HD 5970 lowers clock speeds from the HD 5870, HD 6970 is expected to feature the same clock speeds as the HD 6870 - basically a HD 6870 in CF. This will be much like the HD 4870 X2. The Radeon HD 6970 is scheduled for December.
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