Thanks to our staff/friend at Nexus Forum just posted...
SwiftKey 4 is the new version of the popular keyboard, containing Flow. Both phone & tablet versions are on sale in the Play Store for a limited time. They're also giving away a Nexus 7 tablet! Hit the above link for details.
EDIT: If you've already purchased the keyboard, it shows up as an update for you. No need to purchase it again.
⚡Take Note2 BK's here.. ⚡