Sorry, I forgot about this (hadn't come up in a while) but there's a licensing issue with handwriting in the current beta that means that we're not able to give access to it to anybody who doesn't already own the paid 'enhanced' version of handwriting (or a bundle that includes it) - basically has to do with us migrating to a new handwriting recognition engine in the final version of 4.0 but not having released a beta with that engine yet.
So unfortunately at the moment they would need the enhanced handwriting add-on or a bundle in order to use handwriting in the beta.