When will I receive the Fix for security against hackers and the Swift Keyboard
When the manufacture of the phone fixes the flaw.
I hope you know. The exploit may sound bad... But in practice there's no reason to even be remotely afraid of it. You'd sooner reach the lottery than being exploited from that exploit. Too many factors have to have happen. Samsung already on record they are working on it and Swiftkey already sent their end to Samsung.
There are already a couple of other discussions in the forum about this topic with more information.