So glad I have found this too!
Just started a huge campaign at uni, DESPERATE for internet. Even paid for a tethering package on my phone, to find that I was getting the 169... IP address from that too!!
Not cool, Apple.
Had a phone call from Apple who couldnt fix it and advised me to go get it looked at in the Apple Store tomorrow - not sure if I should bother now after hearing your experiences... doesn't seem that Apple are recognising this as an issue!
I toggled the Firewall to 'on'... which sorted my connection instantly... although I'm pretty sure my firewall was off in the first place - as it pesters me with authorisation every 5 minutes... but seems to be working at present.
Hopefully an update will be released soon enough to fix this!
David