Am I the only one that's actually kind of scared of what this next generation will bring to the OU meta game? If you think about it, this generation could easily either make or break OU. It could definitely improve OU if (like everyone is saying) GameFreak decides to bring Pokemon that could balance out the current weather infested/hyper offensive meta game that OU is becoming. What would make OU a much more competitive and all around more of an enjoyable meta game, are more bulky Pokemon to choose from to counter all this offence, and most importantly Pokemon to counter weather. Air Lock, Cloud Nine, or even a weather stopping move would be just a few of the things that could easily calm down the weather tier. Also, more support Pokemon would be great too. Dual Screening is a great strategy that definitely helps a team's sweeper or hazard setter come in and set up much easier, however with all these weather boosted moves even screens don't do their job as good as they could. Besides, most of the viable dual screeners in OU are pretty lackluster, most which posses pititful bulk like Espeon. Deo-D is a great screener, but you'd be much better off using his hazard set. Also like others are saying, more spin blockers that are actually bulky and resist a lot of things. Cofagrigus would be so much better if it was Ghost/Steel.
Now for what I think would be the breaking point of the OU meta game. If this generation is just like 5th where a majority of the OU viable Pokes are all hyper offensive, OU will become a shit hole. Why? Well little to no strategy would be needed in order to build a team. Most would be forced to sacrifice defense for more offense in order to check the offensive threats. It's already hard enough to build a bulky offensive team with all these offensive behemoths like Terrakion, Keldeo, Kyurem-B, Tornadus-T, and weather boosted moves running rampant in the tier. Of course every gen is going to bring lots of offense, I realize that, but I feel like the only amazing OU viable defensive behemoths that this gen brought us were Ferrothorn, Jellicent, and Eviolite Chansey. Every other defensive Pokemon are from other generations. However even with 4 other gens there is still a lack of defensive presence in OU. Hopefully GameFreak is smart and not only makes bulkier OU Pokemon, but also maybe buffs non OU bulky Pokemon in order to make them OU viable. For example, Cofagrigus would most definitely be OU viable if it was Ghost/Steel, and with it's great ability Mummy and its huge Defensive bulk, it would be a great counter to Technician Breloom, Terrakion, and even Salamence. Also, giving a Ghost type some viable form of recovery other than Pain-Split and Rest would be nice. More Flash Fire Pokemon, Water Absorb and or Storm Drain, and please GameFreak maybe some buffs to hail? Why haven't you released a Chlorophyll or Swift Swim ability for Hail yet? That would be awesome!