Late Friday night and almost in sleep mode...
AQ said that to really reach out to all customers we really need to give our code to NI, but since LV 2011 we have the LabVIEW Tools Network built in to LabVIEW and this enables each and every user to easily install features they need (from OpenG, LAVA or LVTN).
LVTN has no restrictions for licensing that I know of, but NI still reviews and put code under the NI umbrella and even publish some code of their own.
I currently know nothing about JSON, but from reading through the threads here at LAVA it is probably something I will look into in the future. And when I do, I like to be able to select the implementation that I want to use; NI version, LAVA version or any other version.
Installing these from LVTN/VIPM mean that new features/versions are available to me directly and I don't have to wait until the next LabVIEW release. Bugs detected in LVTN modules are also likely to be fixed much faster since the fix can be released regardless of the LabVIEW release cycle.
/J