Question about that game Portal 2?

WHAT IS THIS?? I JUST BEAT THE GAME AND I AM SO CONFUSED :0 SO WHERE DOES THE GIRL GO NEXT AND WHAT IS THE STORY BEHIND IT ALL AND WHEN IS PORTAL 3 COMING OUT??! AAAHHH SOMEONE EXPLAIN EVERYTHING I NEED HELP ITS KILLING MY BRAIN. The story behind it all must be extremely epic and amazing :0
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