You'll have to keep checking www.pokemon-gl.com. It was suppose to be available March 30 but the earthquake in Japan put things on hold for a bit. If you want to make use of it you will need to make an account however when the time comes.
You can get increased chances to get shiny pokemon by using the Masuda Method. Where you breed 2 pokemon from different language games. Your chances increase from 1/8192 to 1/2048. The easiest way to do this is getting a Japanese ditto and breeding it with English pokemon you catch in game.
After you beat the Elite Four you can have pokemon transfered to B&W at the Poke Transfer Lab on Route 15 but they'll stay in gen 5 games. You can't send anything from B&W back to Platinum or any game before generation 5.