Good to know...Well, lets wait and see.A more complete quote:
"This and the next year will be devoted to The Witcher. Apart from the second expansion we have some additional ideas. They should help us animate sales in 2016. The game is selling so well, that we are convinced there are still many people who will buy it if we promote it further."
So, whatever those additional ideas are, they are about increasing the sales of the game (so they are aimed mainly at those who did not buy it yet), and that can be achieved in a number of ways. It could be something simple like a "GOTY edition" bundled with all the DLCs and expansions at a discounted price. Or the same with some additional features sold as an "enhanced" edition. Or more free DLCs - especially since it is said at the end of the article that "we don't want to exploit gamers for their money (which is what many other gaming companies do)".