Well I was in Cashworks a while back and if I remember correctly no lag was had by anyone in the server.
Needless to say I haven't been on any of the other servers recently so no help there. :O
It will probably resemble a double-barreled shotgun of some sort. My guess is that the knock-back from firing the Force-of-Nature is equivalent to another scout jump.
I guess will have to get use to triple-jumping now, or just stick with the regular scattergun.