Some options to consider:
There is already three languages that are dynamically or weakly typed, i would rather see C# since it is truly Object Oriented (as opposed to js and lua) and strongly/implicitly typed. It also supports pointers so it can be very powerful in right hands. And please avoid Java at any cost.
C# is another good idea. The system Jack has, allows him to easily add new languages, so we'll get more eventually with minimal effort.
And don't worry, we wouldn't touch Java with a 10 foot pole.