Hi Raja,
Let's go to the answers:
1) you should contact sales@redhat.com and they will foward you to the right people who can provide you that answer.
2) Both jBPM3 and jBPM5 can run in any container, is just matter of configuration, there shoudln't be any strong dependency on any container
3) If you migrate to jPDL you will probably can achieve exactly the same as you have in those extensions, and you will need to do that twice, first for jBPM3 and then for jBPM5.
It's your call.
Cheers