It would be here; https://www.bitmaintech.com/product.htm
But it does not exist yet. If you see one and its not announced first, then its a scam. Don't do it.
No one knows for sure. A big hoster leaked a date along with info of a lite version. So far he is only person to claim this I think. But he is very big in hosting so a decent amount of creditability have been given to it, compared to if some random person said it:
bitmain told me that new s7 will be released to market after another 10 days, so should be on 10th Nov, they deduce the chip amount on s7, so the hashrate of new s7 will be only around 3.5T. The price for new s7 still under discussion and will be released next week
Only time will tell if/when it happens.