I'll tell you as soon as I can. They already have how to get it for the nexus 7.
But what jay tee says is true it matters on carriers. I'm waiting for 4.1.1 on my s3. It's rolling out internationally already.
I hope you arent on big red as your carrier. im on verizon myself, and we are notorious for getting updates after everyone else. im not expecting to see the jelly bean update until december, but im looking forward to it. the galaxy s3 is already the fastest phone ive ever used, and with jelly bean's project butter enhancements it should be ridiculous.