Hi Sazzadul.
Actually not "two", but a couple of 🙂 Besides some refactorings/improvements of the JobExecutor (yes pangea, it will be easer pluggable as well, but you can exchange it now already) and some internal stuff for BPMN it will be basically "Trigger BPMN Error Events from Java Delegate", "Error Event Sub-Process" and "Multiple Start Events". But best is to watch the JIRA, for all features we will have Issues there assigned to the correct version.
And please do not use this forum thread to discuss scoping of 5.9 or new releases, this post was meant to check if any has serious problems with postponing the release 🙂
Thanks & cheers
Bernd