That looks similar to what I've done, I don't think there's any reason to make a branch unless you need it for something particular - like keeping a master for your plugin and some other for testing stuff out.
I don't think "fetch" is enough though. I have been using "pull" which does a "fetch" and a "merge", so either you will have to do the merge now, or go back and do it again with pull instead of fetch.
Also if you will want to specify tale's "next" branch when you grab his stuff:
git pull
http://www.taletn.com/WDL.git next