owl2 vs jena rules

Hi,
some days back I came across an issue that reasoning with the owl reasoner
did not work as I supposed to work. Thanks to Dave I figured out that my
ontology was using restrictions supported only by owl2. My current
assumption is cover these parts with jena rules.This works fine till now.
And I want to replace them with owl2 semantics once supported by owl2. Is
it a fair assumption so that the expressiveness of jena rules is comparable
to owl2 feature set? Is there any disadvantage of using jena rules besides
missing portability to other engines?
Is there any plan on when jena will suport owl2?
thanks a lot.
Regards,
Stefan