The EB team has already stated that they will not represent invasion, migrations or anything of the sort originating from the area covered by the EB map and which took place a substantial time after 272 BC.
No Teutonic or Cimbric migrations. After all, why the hell would the Teutones try to migrate by force to Italy if say the Sweboz have already conquered it, or the Romans have conquered Germania.
Also, remember that few players ever reach 109-101 BC when the Teutonic invasion took place, and even if they do it´s unlikely that the map will look anything like it did in reality.