There's a report out today that ISIS jihadis attacked a Saudi Arabian border outpost south of Rafha (a city in southwest Iraq). The guards fled and several dozen jihadis were able to "melt into the general population" of the nearby border town.
If ISIS is as entrepreneurial as I believe they are, their pivot south has been in the works for months. This means that rather than waste effort on further gains or holding ground in Kobane and Iraq, they shifted their best forces south to positions within striking distance of the Kingdom.
PS: If this is a full pivot, it's a monumental intelligence error that will be compounded as the situation develops.