Samsung could incorporate the technology into the phone so it could be "S-Pen capable" which means Samsung could sell it as an accessory.
My Mom has the HTC Flyer tablet that came out a couple years back. HTC sold an optional stylus that enabled you to jot notes, highlight text, draw and some other things. But HTC priced the stylus at $75.00 which of course was a complete ripoff.
My Lenovo Thinkpad tablet came with a stylus that actually works very well, especially for jotting notes. Although I don't really use that often.