Semiaccourate talks stock in the channel for March.  Here a slice.

Starting with the fastest single GPU in the world (not for long), the HD 7970, we found that of the 16 listed HD 7970 SKUs only six of them were actually in stock. Of the 11 SKUs listed on Amazon.com one was completely out of stock and four had 15 or less units in stock. So there appears to be a shortage of HD 7970’s at the moment, which might have something to do with this. As far as pricing goes most HD 7970 SKUs seem to be at or hovering a bit above AMD’s $549 MSRP. Most of the overclocked models are being priced just below $700, and of course PowerColor’s LCS (read: water-cooled) model comes in as the most expensive HD 7970 on the market at a cool $799.

Tweaktown relays a few benchmarks comparing the upcoming GeForce GTX 680 versus AMD's current champion Radeon HD 7970.

Benchmarks included 3DMark 11 (performance preset), Battlefield 3, Batman: Arkham City, Call of Duty: Modern Warfare 3, Lost Planet 2, and Unigine Heaven (version not mentioned, could be 1). All tests were run at a constant resolution of 1920x1080, with 8x MSAA on some tests (mentioned in the graphs).

MSI has announced the R7970 Lightning.  

(Industry-CA) Leading international graphics card and mainboard maker MSI today announced the release of the MSI R7970 Lightning, the new heir to the throne of Lightning graphics cards. Equipped with AMD's 28 nm Radeon HD 7970 GPU, the MSI R7970 Lightning features an all-new Unlocked Digital Power Architecture that incorporates an Unlocked BIOS, Digital PWM Controller, and Enhanced Power Design to boost overclocking potential to new heights and make overclocking easier than ever. In an industry first, the proprietary "GPU Reactor" power supply module reduces power supply noise and also boosts overclocking stability as well. To keep this beast cool, the MSI R7970 Lightning utilizes the latest Twin Frozr IV Thermal Design equipped with Dust Removal Technology. The dual 10 cm fans with Propeller Blade Technology generate massive airflow for fast heat dissipation while remaining whisper silent. The two form-in-one heat sinks improve cooling for memory and the power supply module as well ensure structural integrity. The R7970 Lightning uses Military Class III components which have passed rigorous third-party testing to meet MIL-STD-810G standards, guaranteeing the card's stability and reliability under actual use conditions. Moreover, the "3X3 OC Kits" are designed to simplify overclocking, which makes it easier than ever for enthusiasts to fine-tune the performance of their graphics cards. For both professional users and gaming enthusiasts alike, the R7970 Lightning's ability to simultaneously run 6 displays makes it the natural choice!

Today AMD has released the Radeon HD 6850 and 6870.  Reviews are listed below.

7850 and 7870

Anandtech
 Guru3D
 Hardware Canucks 
 Hardware Heaven
 Hexus
 Hot Hardware
 Legion Hardware
 Rage3D
 Techpowerup
 Tech Republik Tech Spot

7850

Hardware Secrets
 Tweaktown

7870

Hardware Secrets
 tbreak
 Tweaktown
 

Legit Reviews has a sweet article comparing integrated graphics from 2006 forward with AMD going against Intel.  

For years both AMD and Intel have claimed to lead integrated graphics performance, but not too many enthusiast and gaming sites actually look at integrated graphics let alone look at the performance gains over many years of products. That gave us the idea to do just that and it would also give us some numbers to use again when AMD launches Trinity and Intel launches Ivy Bridge processors later in 2012.