A "potential fork" refers to a situation where a project or community may divide or split into two separate directions. It typically happens when there are disagreements or different ideas on how to move forward. Full definition
OKCoin's Global OKEx Platform Will Suspend Bitcoin Trading During Potential Fork — Some Exchanges are sending out this message to their clients — heed this as a warning to not keep your Bitcoins in a hot wallet on an exchange. (bit-media.org)