I really want to get the K712 sometime, I always loved the AKG sound and found they tend to have great timbre. I agree the Q701 is a bit too thin sounding, and it has an unfocused center soundstage. I would love something fairly similar to the thick luscious sound the K240 has but better, the K712 seems like best option in terms of an upgrade in the AKG camp. Going to wait until the price drops and I can actually afford it.
If you like the K240, I think the K712 will be a pretty natural upgrade. I did a little review of the K240 in comparison to the Anniversary: http://www.head-fi.org/t/664045/akg-k240-studio-comparison-review
The K712 moves slightly closer to the K240 in sound since it's a tad lusher and fuller than the Anniversary.
Razor dog has them for 399, and may eventually drop them to ~350 after several months have passed. I think that's as low as the Anniversaries ever got. They started going back up recently (I assume from the "limited edition" status and supply slowly running down). Same story for Amazon's pricing: http://camelcamelcamel.com/AKG-K702-65th-Anniversary-Edition/product/B00A8LZ5GU
I doubt the K712 will drop too much though, as AKG now has made-in-China K702s as well as Q701s. I think part of their "Pro" branding is to signify that it's the line that's still made in Austria, and I assume they will try to keep it at a higher price to differentiate it more from the ~$250 K702 and Q701. Razor Dog said the K712s currently cost him $50 more than the Anniversaries to obtain. I think AKG means for the the K712 to compete more directly with the HD650 in price than with ~250-300 phones.
Edited by chicolom - 9/2/13 at 5:15pm