The security bugs fixed are all labeled as "medium" level threats, and that brings a bounty of $500 for whoever finds them. This new Chrome update has 7 security bugs found by two different people, meaning Google ended up paying out $3500 just for the reports that these bugs existed. Artem Chaykin made $1000 for finding a bug on "Information and credential disclosure", and one on "Current-tab cross-application scripting".
Good job to Artem and Takeshi. And, if you want to take advantage of the new security fixes, you'll need an Android device running ICS or Jelly Bean, and you'll need to jump over to the Google Play Store to get the update.
source: Google Chrome Release Blog