According to thomann.de the rack version is available 1/03/2013.
The strange part is that they sell it for 1544€ with the poweramp. I suspect that this is an oversight because that is the price of the toaster without the amp and they sell the one with the poweramp for 2090€.
http://www.thomann.de/be/kempe…ing_amplifier_bk_rack.htm
From the description:
(incl. 600 W class D power amp (600 W @ 8 ohms, 300 W @ 16 ohms)
So maybe if you order the one for 1544 and say that the website stated that the poweramp is included you get it for 1544 You can always try