Let's speculate on new sniper weapons!
Okay, I was a big fan of leg shots in TFC. There's kind of no point when you can just kill them with a headshot, but leg shots worked without being fully charged. So my guess for the primary replacement is: A rifle that takes 50% longer to charge, but can slow someone for three seconds if you shoot them in the leg when at least, iunno, 1/3 charged.
What do snipers hate...well, among other things, spies. I'm going out on a real limb here and suggesting that snipers might get something to deal with that little spy problem while requiring more devoted teamwork. Replace the machine gun with binoculars that don't zoom very hard, but can spot cloaked spies! They DON'T tag them for your team...that's your job! Voice chat makes it easy. Hell, let's throw in enemy ubercharge % while we're at it.
That leaves the machete...though my binocs idea could easily have replaced the machete instead. However, nobody likes giving up a melee weapon so let's keep it. I'm guessing... A BIGGER MACHETE. As in, "THIS is a knife." Snipers like charging shots, right? Let them spend a second to charge up a swing for higher damage, or... Let's say 50% crit chance. Something along those lines. Lets you take down a spy from the front or do a little back stabbin' of your own, makes you scary to an unprepared opponent, but dude, it's just a knife, they can back out of range if they want.
So my guesses are a Legshot Rifle, Binoculars, and a Bigger Knife.