Funnily enough, for whatever reason it’s not available on Google Play, but through the Swype beta program anyone can get the latest beta version of Swype on their phone. If you want the latest beta version of Swype and your phone didn’t come with it preinstalled, simply head to beta.swype.com, sign up and follow the instructions.
It used to be the case that matters were more complicated if your phone already came with Swype pre-installed, but users are now able to install the Swype Beta version alongside pre-installed Swype versions. In any case, the version of Swype that the beta program provides with you includes an updater, so you’ll always have the latest version. Additionally, you can post feedback and feature requests in the forum.