I have been playing online with some of the other Saints, so I usually end up carrying the Sniper Rifle and the MP5SD w/ scope as a side.
I am sure there will be more weapons added in the full version. In one of the trailers we got to preview early on it showed a squad taking out a tank and they used smoke and AT - so I am pretty sure we will see more weapons in the full version.
So far it has been fun firing all of the weapons. Pretty much anyone you hit and anywhere with the sniper rifle puts them down. GJ on the weapons and can't wait to see more!