I was considering buying the HP & Damage Tracker cards. I noticed on several websites they were a little difficult to use because of the small numbers. I would make a suggestion when you redo the group for the new expansions. Make them oversized like the Villain card pack you listed in the Kickstarter. You could have larger numbers and would be easier to use a token. If nothing else make a generic one that you can lay the hero - villain card on top of. It uses less game table space as well. Not sure what your card size limitations are.
It's a good suggestion, but I wouldn't be surprised if the hp tracker cards are a dead issue at this point. The new hp and effect tokens pretty much handle that issue and seem to be the prefered solution from >G's point of view.
Also its the fact that tokens are expandable so they do not have to print more HP trackers for future Heroes.
Though if they posted ones that people can print off by themselves it would just be awesome(As part of the Download section).