The SwiftKey beta app for Android will not replace the regular SwiftKey app on your phone, but will be downloaded as a second app so you can switch between the two for comparison.
Features in the beta app are in active development and might not work perfectly or ever be released to the main SwiftKey app.
How you can help make SwiftKey better
As a beta tester, we rely on you to help us find bugs and give us feedback on new features. To give us feedback or report any bugs, head on over to our Support Forums https://support.swiftkey.com/hc/en-us/community/topics/115000099425-Android-Support-Forums – We have a group of moderators and SwiftKey staff members that are actively looking and responding to feedback.
You can also Tweet us @SwiftKey
SwiftKey Android & Community Team