We're on 2.8 and use both Rubrics and Outcomes to mark our assignments, as detailed (at length) here
We also now use Marking Workflow to manage the Internal Verification (IV) process. With Workflow status set to 'In Marking', when learners view their Assignment page Moodle's behaviour is correct: they cannot see their marks, Rubric, Outcomes or feedback.
However, if they look at their Gradebook, the Outcome marks (although nothing else) are displayed.
It appears as if Outcomes fall outside the control of the Marking Workflow in Gradebook which is causing problems with our IV process because learners are not supposed to see their marks until IV has taken place.
Our workaround has been to hide the offending Category in Gradebook until the Marking Workflow Status for the Assignment is set to 'Marks Released' but surely we shouldn't have to resort to something so inelegant?!
Really just gauging whether others have found this, and trying to drum up some votes for https://tracker.moodle.org/browse/MDL-49277 which details this bug!
(It's just been confirmed as a Major Bug, but the more votes it gets, the more likely it is to be fixed sooner, and I think is a real issue for anyone who combines Outcomes with Workflow, each on their own fantastically useful features but so far not complementary when used together).
Cheers all!