They were already released in FCC, maybe available in a few months.
http://www.itechnews.net/2010/03/07/...eless-routers/
ASUS RT-N56U:
CPU: RALINK 3662F 500MHZ
ASUS RT-N76U:
BCM4748 - INTENSI-FI® XLR 2 Ч 2 IEEE 802.11N 2.4 GHZ + 5 GHZ SOC
http://www.broadcom.com/collateral/pb/4748-PB00-R.pdf