If the rebels being trained were picked by the Saudis (they almost certainly were) then you can pretty much guarantee they are of the hardline salafist variety.

Via IHS Janes:

Free Syrian Army (FSA) units are receiving intensive training from US Marine Corps personnel in Saudi Arabia, a senior FSA source has told IHS Jane’s .

The source said the United States and Saudi Arabia have agreed to train around 1,500 insurgents. The programme began a few months ago and most of the personnel will be trained by the end of 2013.

The courses last for 100 days and include fighting in built up areas (FIBUA). The most recent intake that arrived from Jordan on 13 October consists of around 40% from insurgent groups operating inside Syria, with the rest recruited from refugees in neighbouring countries.