Not sure if it is such a big deal, US carriers come and go, they have somewhat of a schedule of regular deployments so you have to find out if this deployment was advanced or if the area of operations was changed to make it significant.
There are a lot of rumors flying around the net, I read something about eminent declaration of no fly zone over Syria, also Russians giving S300s and Russian carrier deployment to Syria, etc...not sure how credible any of this stuff is. I wouldn't bet my life on any of this info personally.
Also not sure how much Russia or China are really behind present regime in Syria, if things get any nastier, do they really want to be associated or help a regime that looks weaker by the day and shoots so many of its own people? We might be seeing the beginnings of a civil war in Syria or Egypt for that matter, not sure Western powers, Russia or China want to be seen taking sides.