Computer chess programs have gotten very good. Not only in terms of raw computational power, but the very best have improved their play a lot. Deep Junior in particular has a very aggressive attacking style. Consider for example this game, played as black, which involves seemingly almost accidentally sacrificing two pawns so that a knight can take a liesurely stroll across the board to the opponent's king. Unlike many of the celebrated human attacks, this is done against Diep, a no-slouch computer competitor which placed third in the tournament. Many famous chess games turn out to have had extremely bad play by the losing side, with the celebrated attack being unfortunately unsound. With Diep as the opponent, it's doubtful that any simple or even not so simple tactics were overlooked.
Hopefully this newfound attacking ability will make there be not so many goddamn draws in high-level chess. The long-feared draw death has been essentially happening at the highest levels of human competition, and the way computers were able to defend much better than they could attack probably exacerbated the problem a lot.