There are currently 3 forks of WPUF happening.
Tareq (the originator) is working on a new version that updates the customization features and uses an entirely new interface that makes customization a breeze and adds the capability of multiple customized forms. This isn't yet up on the net.
gpspake has also done a fork that looks at a few things.
We are all collaborating and we currently are of the opinion that the current custom fields implementation complicates things too much and Tareqs new customization methodology addresses this. So we are considering breaking things into two and having a basic version ( without custom fields that satisfies most users and is easy to use), and a Pro version (that allows complete customisation and multiple forms).