should I upgrade to 4.0.0?

[Dapeng, Sun]

Hi all
I have some questions about OOZIE 4.0.0. I'm using OOZIE 3.3.0 and going to 
upgrade to 4.0.0

1.       Is 4.0.0 backward compatible with 3.3.0 ?

2.       Any company has already use 4.0.0 in production environment ?


Thanks and Regards
Dapeng