The current beta version should be feature-complete; unless anything "aggrevating" shows up the main focus of 1.0 development will be on fixing bugs, refactoring and testing. Hopefully a final version will be available at latest in mid-October (depending on the number of issues arising and how fast they can be fixed).
Obviously, there are a lot of features on the soapui wishlist for upcoming versions, add a feature request and it will be prioritized accordingly..(or even better, contribute these improvements yourself!)
Some of the features currently being considered (in no special order, let us know what you prefer!):
For those of you aquainted with soapui, the following "fixes" are scheduled for the next minor release (after 1.0).