The Hillsborough County BOCC meeting to be held Wed., 2/22, has the following agenda item:

10:15 AM B-5

LIST OF ITEMS SCHEDULED FOR A TIME CERTAIN

Direct the County Attorney's Office to schedule and advertise one or more public hearings or workshops regarding the proposed draft ordinance, calling for a referendum for the voters to consider a charter amendment to expand the number of single member commission districts from four to five. Approval of this item will have no financial impact on the FY 12 Adopted Budget. 

County Charter info from the BOCC website: 

Here are some articles of interest regarding this issue and transcript of BOCC meeting late last year discussing:

Hillsborough commissioners to continue debate on board makeup

Hillsborough Commissioners discuss changing makeup of board

Transcript of 11/9 BOCC workshop - transcript begins on page 14

It appears that a vote will be taken at BOCC Wed meeting whether to schedule public hearings on this issue. This change would require a county referendum to be voted on.