The S pen work great on my Note 3 but is whole different technology, form the regular stylus. I think that the technology is developed by IBM and for sure it will be expensive to be implemented into the next Pandora. ( I hope to be wrong here)
Are you sure?
Samsung invested heavily in Wacom shares and from all the research I've done It seemed pretty clear to me that the digitizers in the Note series are all developed by Wacom. - Gives them something of an edge in the digitizer world as Wacom are the recognized leaders in that area.
In fact, if I remember correctly, Wacom sold their basic tech to other companies as well. Once upon a time Wacom were the only players in the game, but a few cheaper competitors have surfaced in the recent years.