New board spin #09 if I read correctly. The Admtek ADM6996L was dropped for a Broadcom BCM5325, the two SDRAM packages replaced by (here) a Hynix HY5DU561622DT DDR SDRAM part. The single 3.3v switching regulator in the prior design is replaced by two separate switching regulators which provide 3.3v and 5.0v directly from the 12v power supply. These are Anachip AP1509 parts which can tolerate up to 24v input and supply 2A:
http://www.anachip.com/downloads/datasheets/power/sw_reg/AP1509.pdf
The 1.8v used on the new board is provided by another Anachip device AP1605 which is a secondary switching regulator off the above +5 rail and can supply 3A:
http://www.anachip.com/downloads/datasheets/power/sw_reg/AP1605.pdf
There is also a low dropout linear regulator which provides 2.5V from the 3.3V rail for use (apparently) by the Hynix SDRAM. This is a RichTek RT9167 LDO regulator rated at 500mA:
And if there was ever a hope of getting access to the BCM4712 USB pins, well there isn't a snowball's chance in hell of doing so now. The 4712 part is now in a chip/ball grid package.
Details of the crime (top):
http://www.seattlewireless.net/images/uploaded/96452.1105535270.jpg
and bottom:
http://www.seattlewireless.net/images/uploaded/96658.1105535409.jpg
Serial header is 'aftermarket'. You didn't think Linksys was really going to spring for that now did you? However it is curious on at least this particular board as the serial header thru holes were clear of solder. Maybe they are making it easy? 
-jc
