I see where you're coming from, but it would do well to boost press and tickets in whichever markets they need to fill. They don't need to play many new songs. Only a couple would suffice. They do have a history of playing new songs prior to an album's release, but yeah, the YouTube factor could very well come into play.
At this point, i hope they trial some new songs in South America and come back on the last NA leg with them. I know it's too optimistic for Guns, but i'm sick of seeing fashion shit, lol. Give us something good.