No, you are not going to receive anything on GDAX just because they are not going to support forks, they never did.
If you want that piece of shit created in a fork, just go to binance or bitstamp, they are always crediting the holders with the forks if you had that coin before the block in where the fork was submitted.
If you are lucky you will probably get at least $10 from that fork! Yay! Hurra! What a nice deal right?
Is this definitely happening?
if i have btc in gdax, do i get the free coins?
Yeah and you also would risk your bitcoins afterwards.
Just be sure that you can get it back or else it might end up stuck with them.
There is always that risk when it comes to storing bitcoin in trading website. It is not recommended for all.
Why not just stay and let bitcoin give you a better profit than other coins which you are not sure about.