The mysteries surrounding the Israeli strike on a Syrian "structure" seem to be blossoming exponentially as more information concerning the incident is slowly being leaked.
There's myriad theories and speculations that are bouncing around on the web, but here are two trust-worthy sources that I recommend you consult if you're interested in the matter:
Jeffery Lewis, Director of the Nuclear Strategy and Nonproliferation Initiative at the New America Foundation, has been dedicating a lot of his posts lately to this topic, over at Arms Control Wonk, and his most recent post is particularly intersting (as are the comments to the post).
Also the China Matters blog has a number of posts found here, here, and here, that you should check out if you're interested in sifting through the sediment of rumors and hypothesis' in the pursuit of a golden nugget of truth. ; - )