The syrian conflict is an Iranian/Israeli proxy war. And lately, the rebels(backed by the israelis) have been taking a pasting. There is obviously no new information about Chemical weapons, what has happened is a few key victories by the Syrian government who are on the verge of finishing off the rebels. The question is, will american intervention come too late to save the rebels. If the rebels loose, then Lebanon may erupt, if hezbollah / syria takes Lebanon, Israel is in trouble.
Of course this has nothing to do with the USA, and we are better staying out of it. Israel is between a rock and a hard place.