Michael Totten notices that the Lebanese daily newspaper Al Mustaqbal reports a limited Syrian invasion of Lebanon. Ynet News reports that Syria is warning its citizens that Lebanon "will erupt" within a week. The Counterterrorism Blog has background.
There have been a number of "eruption warnings" from Lebanon, though none of them have fully materialized. That doesn't mean this won't. The question is what might be different this time that could lead to large scale hostilities. One possible answer is the scale of re-armament by Hezbollah. In a situation where intentions are opaque, but are traditionally hostile or at least testy, then the thing to watch is capability. The tempers are known to be bad, so the key question whether the hombres have enough rounds in their crossed bandoliers. Perhaps Hezbollah and Syria now feel they have the capability to restart the fireworks. If so, then UNIFIL's mission will have failed, though that would not be surprising. Nothing to do but watch and wait.