Our newsletters are where you can find out about the plans for the full iPad version:
http://www.wolflair.com/news/newsletter/june-2014/ As of the June newsletter, the plan was for submission to the Apple Store late this month.
You can add additional licenses to your account through the "Obtain Secondary License" option in the License menu within Hero Lab. License number 2 is free (sounds like you've already gotten that one), the third and fourth cost $10 each, and once the full iPad version is available, the option to purchase a fifth at $10 will become available. All secondary licenses share the same purchased game systems and packages as the main license they're linked to.