I think this generation is going to be very weather-based, with sandstorm teams looking especially terrifying. For one thing, sunny day/rain dance teams need a pokemon to use the move, sandstorm is automatically set up by something with sand stream and lasts until someone else uses a weather move. Until now, rain dance teams were probably the most viable due to water's potency as a type and the usefulness of swift swim. Now that sand throw is in the game, that's going to change.
Doryuuzu is a ground/steel type mole with base:
110 hp
135 atk
60 def
50 spa
60 spdef
88 speed
Even with an adamant nature, it'll reach ~550 speed in a sandstorm, which is pretty much only outran by stuff like scarf aerodactyl. With that typing, chances are it'll have access to earthquake and stone edge along with god knows what else to pulverize anything on the other team.
On top of that, you've got the new archaeopteryx with 140 atk/110 speed (revenge killer, anyone?), the fossil turtle with 133 defense and lower special defense that would love to get boosted by sandstorm and solid as an ability to help negate its lackluster water/rock typing. Gigaiasu would also become extremely sturdy in sandstorm, considering its 85/130/70 defenses and potent attack. Not to even mention all the new steels that will go well in sandstorm.
As far as older pokemon go, tyranitar is getting sand throw to put it up to speed with all this crazy new stuff. In a frail, hyperoffensive metagame, I'm sure good old CB bullet punch scizor while prove more than useful.
I dunno about you guys, but I'm strongly considering going for a sand storm team in generation five. I think for 3v3 matches I'll a setup using something along the lines of hippowdon to bring sand storm into play ASAP, doryuuzu to earthquake off the bat and decimate any opposing pokemon that aren't flying. First turn, hippowdon would protect to negate EQ damage or take the EQ and ice fang a flyer. Meanwhile, I think I'll be using a choice scarfed archaeopterix to knock something else out, since its flying typing will allow it to ignore doryuuzu's earthquake. Sandstorm will finish of any non-steel/ground/rock types wearing a focus sash.