the poll ends on the 14th, so I assume that if they don't update on that day they will at least announce the decision and the update date. I am very doubtful as well as to them denying it but its possible, hope they choose correctly though, Im already almost finished building my staker!
EDIT: also, they did say in the clan chat that the code inputting and changes that needed to be made IF the vote passed would only take a few days to implement because they would have "the entire Jagex team on it", so I assume that if they are bringing it back, a few days after the 14th would be when the update hit, and maybe at the latest tuesday because they update on tuesday alot.