SES-10 will be launched in a few days on Space-X's first commercial launch using a recycled rocket.
50 high-power Ku-Band transponders to provide excellent coverage of the Gulf of Mexico, serve the Spanish speaking South America in one single beam, and offer complete coverage of Brazil with the ability to support oil and gas exploration off the shores of Brazil. It will replace the capacity currently provided by SES’s AMC-3 and AMC-4 satellites at that location, as well as bring additional capacity to Mexico, Central America, South America and the Caribbean. The high-powered, tailored and flexible beams will provide direct-to-home broadcasting, enterprise and mobility services.
Footprints are also shown on SES's page for SES-10 which seems to indicate there are 55 Ku-band transponders used to form these beams. Compare to other SES footprints. I believe "HTS" stands for "High Throughput Satellite".
I've tried to find images of what SES-10 would actually look like unfolded and deployed in orbit, but it is difficult. I'm wondering, is a flat, phased array used for beam forming, or are there carefully shaped groups of transponders at the focal plane of each of the dishes, and it's the shape of he transponder cluster for each dish that produces the footprint shape? While certain details might be proprietary, shaped footprints for commercial satellites are so well established now that there must be something that describes in at least some technical detail how this is done.
below x2: screen shots from the three linked pages from here.
below: From SES-10's image gallery.
below: From Spaceflight Now.