OK, that wasn't quite the question you asked in the first place.
Yes, teachers can see the full history of the submissions and feedback, by clicking through to the individual student grading screen. However, there is (currently) no way to directly view the grading history from either the 'grading overview' page within the assignment, or the course gradebook.
I would be curious to know where on the assignment grading overview page you would expect the grading history to appear; the page is already pretty full of information, so I can't imagine where you would squeeze in the grade history as well. Maybe you could describe where you think it should appear (or, even better, draw it onto a screenshot) and then post it as a suggested improvement to tracker.moodle.org