JON 2.3, scheduled for release in late September, will support EAP 5.0. When it's released, AS 5.2 should also be manageable via JON, though that will not be officially supported.
If you don't see the EAP plugin pack on the CSP, you may not have a license for it. I would check with your sales rep to make sure you have a license for it. If you do have a license and still don't see the download link, open a support case and they should be able to fix it for you.
Ok thx for the quick response!