Kraken said they will see later if they're implement btg, because of a lack of information about btg technical issues.
For Bitterex, btg is ok, but the trade may not sure at all...

>>Are we going to get the same amount of BTG on October 25 when the fork happens...
 1:1 ratio is platform dependent, stay tunes to them for more information

>>Or is it possible that a snapshot occurs at an earlier date?
platform dependent too...