The beta is out now. Hard for me to copy and paste the APKs right now, but I'll do it in a few hours if no one beats me to it.
[edit]
Not so hard:
SwiftKey Flow Beta APK (smartphone)
http://bit.ly/skflowbeta
SwiftKey Flow Beta APK (tablet)
http://bit.ly/skflowbetatab
[edit2]
And if that doesn't work, go here:
http://www.swiftkey.net/en/blog/swif...beta-now-open/