In short: the game will insist on using always-online authentication, forbid modding (allowing access to the engine or tools), and include a market for the buying and selling of items. The first means you won’t be able to play the game on a plane. The second means that fans will not be allowed to fully express themselves. And the third means that those with more money may progress faster.
Of the three ideas, only the third is smart. Most players really don’t mind if others have used a shortcut to their success as long as it doesn’t affect them directly. But the other two are terrible. They are indicative of a growing trend in publishing to try and keep players at bay. They may work in the short term, but as long term strategies they are fraught with danger.