I believe this story is complete. There is at least one known issue (bug 840270) but I think this is a polish bug that does not need to block this story.
Asa to conduct testing.
In testing, with 2013-02-14 mozilla-central Metro Firefox, we found several items. The first defect is that the page scrolls (presumably to make room for the on-screen keyboard) when interacting with forms. See http://www.lehigh.edu/~inwww/form-test.html where typing or even simply tabbing through the forms, the page scrolls up some. The second defect is that a simple select widgets show a touch pop-up rather than the regular pointer-based pop-up. (possibly covered by bug 840270) The third defect is that multiple select widgets show a touch pop-up rather than having direct interaction. (bug 840270) We need to have at least the second and third issues addressed before we can resolve this story. I'm going to assume that the scrolling behavior is part of the scrolling for on-screen keyboard story and we can handle that there.
Scrolling / focus related problems are down in the form manager. bug 785425 was filed on reworking this area of the code to try and fix these issues.
I believe this can be resolved. There exists story bug 855434 to catch any remaining broken HTML forms.