I'm expecting that they won't blow the season 10 legend on some arbitrary no-name character. One of the favourites from Titanfall seems almost a definite to me.
To the bonus question: They will keep adding and adding and adding. The bottom line is that if a company is forced to pick, money comes before the notion of a properly balanced game. And to do that they need weapons and characters to sell skins for. It is a very common compromise that competitive games have to make when they are designed as mtx cash cows from the very beginning. At least it's not as egregious as Riot releasing a new champion every week as they once did.
