"There’s a change coming soon to Ad-Aware Free that will give you the power to protect yourself online like never before if you are a freeware user: when the new version of Ad-Aware Free launches, it will combine Lavasoft’s pioneer technology for anti-spyware with traditional anti-virus protection. Stay tuned for Ad-Aware Free Internet Security – basic protection against spyware, rootkits, and viruses."

The current antivirus product in Ad-Aware is VIPRE from Sunbelt-Security. I presume that will remain the same with the free product release.

Sneak Peek: New Changes Coming to Ad-Aware In July! | Lavasoft