The first paragraph on that page is the important one:
The pChart library is released under two different licenses. If your application is not a commercial one (eg: you make no money by redistributing it) then the GNU GPLv3 license (General Public License) applies. This license allows you to freely integrate this library in your applications, modify the code and redistribute it in bundled packages as long as your application is also distributed with the GPL license.
Once it is under the GPL it can be used without restrictions.
Let's hope they keep it that way for release.