Ellison will definitely not run. I would vote Warren in this primary, she's the only good Dem option (sans Ellison) with a real shot at winning the general election.
I don't think Ellison will run (or would be successful) given current sentiments probably won't change that soon (anti-Muslim smears). I don't know if Warren "wants" to be pres/would run, but I would support her if she did. I really want Nina Turner to run but given her large loss for Ohio A.G. iirc and being Pres. of OurRevolution / an activist, she may wish to not try running for office again.