Tummy tuck: Will I need a fleur de lis? What results could I expect? Will I be able to have a flat tummy?

Yes! You will certainly have improvement with a Fleur-de-Lis(FDL) abdominoplasty as well as with a lower body lift (FDL). The FDL will address both the vertical and horizontal laxity you have giving you a much improved shape and contour. By going all the way around your body with the lower body lift further improves your overall shape and contour. My only concern for you would be is determining your weight status. If your weight is stable and you are at your goal weight then you maybe ready to proceed forward with surgery. If you are planning on losing more weight then I would recommend waiting until you are stable. I would certainly contact a plastic surgeon and learn about your options in person and learn about what is involved in each of these procedures. 

I perform a LOT of body contouring for weight loss patients and based on your photos, a standard tummy tuck would be a disservice to you.  The Fleur-de-Lis is the only way to get you a waistline if combined with aggressive flank liposuction.  As mentioned previously, a LBL is clearly an option, but you could have both done at the same time.  Please see a plastic surgeon who has experience with these cases.Good Luck!