Three codes could be found in The New Wave Enlightened: Your Observations post on the Investigate Ingress blog.
[1] p5abl2o2em7rwcpl5w
[2] nxzehgfgfekfhmtgltzw
[3] 羊レ尺几工んモ了廾尺ヨ巨丁ら廿片凡己丹卞井尺巳モ乍工レ臣乍亜レ巨互甲
Code #1
Observations
18 characters with the right amount of numbers to get a passcode
Code #2
Observations
20 characters. Look carefully at the start of the string
Code #3
Observations
A mix of Chinese and Japanese characters. What do they look like !