Some pretty dangerous threats I've noticed so far:
Hone Claws Durant: Durant is pretty much the fastest thing in the tier, and he basically just destroys any wall in the tier right now. Even most Weezings are 2HKOed. I've been running Hone Claws / Iron Head / Rock Slide / X-Scissor with an EV spread of 252 Atk / 252 Spe Jolly nature.
Scolipede: He's super fast, and a STAB Megahorn is awesome to have in this metagame. Even without any Attack investment, he does about ~45% to practically everything in the tier that doesn't resist his Megahorn. Also Toxic Spikes are pretty kick ass to have in this meta.
I tried out a Hone Claws Durant in UU and it did moderately well, but it had a lot of counters.
I am glad there is an RU tier now, because a Hone Claws Durant fits in as a top threat here.
I also love that Scolipede gets to shine here as well.
Honestly a lot of bug pokemon are excelling in RU:
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Durant (Hone Claws Sweeper)
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Scolipede (Fast and Strong Toxic Spiker)
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Yanmega (Speed Boost/Tinted Lens Sweeper)
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Venomoth (Quiver Dance Baton Passer)
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Ninjask (Swords Dance/Speed Boost Baton Passer)
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Scyther (Eviolite Swords Dance Sweeper)
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Galvantula (Compoundeyes Special Sweeper)
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Accelgor (Fast Spiker and Decent Special Sweeper)
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Crustle (Stealth Rocks Lead/Shell Smasher)
I would also like to suggest that we make an RU tier for 4th gen as well. Although it is a generation late, I would think people would generally enjoy being able to have a smaller selection of choices for NU (since 4th gen NU is like 300 pokemon).
Cofag as a TR mon is nice as it screws over Mega and Sharky.
The rise in Cofagrigus usage might make the usage of Slaking and Archeops rise as well. I have seen a pretty successful team that had Cofagrigus give Mummy, then have Slaking pursuit him.