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WPCentral reports that AT&T has marked their current Windows Phone 7 line-up, including the Samsung Focus, LG Quantum, HTC Surround and also the HTC HD7s as end of life, meaning current stock will be sold-out but not replenished.
Fortunately AT&T has already announced their new Windows Phone 7.5 line-up, including the Samsung Focus S, HTC Titan and Samsung Focus Flash. Interestingly it does mean the end of Windows Phone 7 device with a hard keyboard on the network, but I suspect those were never big sellers.
Now the only question which remains is when AT&T will release the new crop of devices.