Ugg, I didn't realize it had changed and I compiled new versions of games without even looking.
ludei, can you confirm if the old extension JSON setup still works as well?
Mine looks like this.
{
"moPubBannerUnitiPhone": "myID",
"moPubBannerUnitiPad": "myID",
"moPubBannerUnitAndroid": "myID"
}