AMD confirmed the name of RV770 and R700: Radeon HD 4800 family. It will have RV770PRO Radeon HD 4850, RV770XT Radeon HD 4870 and R700 Radeon HD 4870 X2. AMD will ship out RV770 GPU to AIB at the end of this month and the graphics card will launch in next month.
Radeon HD 4850 will be released on June 18th, 229$.
Radeon HD 4870 will be released on June 25th, for the GDDR5 supply problem, it will come into the market in July, at 349$.
Radeon HD 4870 X2 possible in September and the price will be 529-549$.
The clock of Radeon HD 4870 will be no more than 800MHz but there is no problem to overclock it to more than 1GHz
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