Depends... it may have some type of semi-adaptive difficulty or even difficulty options. However, hard will likely depend on play style. Stealth is almost always overpowered in most games per design because stealth is a skill set and it has absolute authority over most difficulty challenges a game can impose via simply bypassing them entirely. Gun fights and bosses are where difficulty will tend to have the biggest impact. I wouldn't get your hopes up if you are the type to play heavily stealth oriented, but anyone else it may be able to cater to so long as they don't also have excessively overpowered builds/strategies that can be exploited.