In summary.
Yet another bitcoin, designed to be mined with GPUs with Equihash as PoW algorithm because in this manner bitcoin mining would become decentralized again... blah blah blah fuckin blah...
You will receive an amount of bitcoin gold equal to the amount of bitcoin you already had back in October 24th.
Re-adjustment algorithm (“DigiShield”) adjusts mining difficulty with every block, not every two weeks.
BTG also includes strong replay protection and a new address scheme, ensuring that no users spend BTC when they mean to spend BTG, and vice versa.
Includes SegWit.
Bitcoin futures have reached up to 450$ (prices oscilate though around 180-250$).
BUT... developers have been premining approximately 100,000 coins, which they claim will be used to help fund the growth and development of the bitcoin gold ecosystem.
Now... where are my coins!!! :D
PS: If you wanna retrieve your coins, beware who your sharing your private keys with!!! You could get your bitcoin (legacy) stolen!!! I would recommend to wait to the procedures stated in your wallet provider to retrieve your new bitcoingold.
Sources:
https://bitcoingold.org/
https://bitcoinmagazine.com/articles/bitcoin-gold-launches-tomorrow1/
https://themerkle.com/bitcoin-gold-will-finally-launch-on-november-12/
https://www.coindesk.com/bitcoin-gold-release-cryptocurrency-sunday/
https://news.bitcoin.com/bitcoin-gold-plans-to-launch-its-network-on-november-12/
http://www.newsbtc.com/2017/11/11/bitcoin-gold-futures-surpass-450-one-day-launch/
https://www.cryptocoinsnews.com/bitcoin-gold-to-launch-on-november-12-but-will-anyone-care/