Until that time there are some top tier places you can go.
Smogon Victory road forums- These were just recently created and stand above anything smogon has ever made for getting good.
Essentially they took all the best people on the site made the forum invite only to them and only they can post threads on OU analysis and about being good at the game.
Behold
http://www.smogon.com/forums/forums/victory-road.293/Read every thread there.
For more stuff on XY OU
http://www.smogon.com/forums/forums/overused.281/These two should give you a big lowdown on how the meta is working right now and a lot of especially insightful information for building your teams very well
Additionally when you team build you need to build against what is being used the most in the format and you need to know what their mvoesets are so you're going to need to commit the pokemon showdowns usage stats
Finally it is very important for you to know just how hard your selected sweepers can swing for damage on the entire tier. Although tiring you will finally want to take a damage calculator, put your sweeper in it, and log all of its attacks in against every pokemon in the metagame. This will let you see first hand what you can kill easily and what you can't
