TechPowerUp reports AMD is planning to release the Radeon HD 4860 on August 18th, this part is expected to cost around $120-$130. Another new GPU that will arrive soon is the Radeon HD 4750, this part is based on the 40nm RV740 and is slightly slower than the Radeon HD 4770. It should retail for around $88 but the initial availability will be rather small.
The HD 4750 has similar specifications to the HD 4770. It even sports GDDR5 memory. The RV740 core runs at 730 MHz, and its memory at 800 MHz (3200 MHz effective). While the memory clock speed is identical to that of the HD 4770, the core is clocked slightly lower. Overall, the card won't have as much overclocking headroom as the HD 4770, because it will not draw power from a 6-pin power connector. The design ensures existing low-performing raw materials are utilized more effectively.