I called Samsung Support and they helped me to change the wifi sleep policy from "never" to "when screen turns off". I will let you know if this results in a resolution to battery drain issue. It sounds like it will fix it.
2. Wireless and Network
3. Wifi Settings
4. Click Menu Button (next to Home Button) and Select Advanced
5. Select Wi-Fi sleep policy
6. Change it from "Never" to either "Never when plugged in" or "When Screen turns off".