FanGraphs' release of the following season's ZiPS projections is always fun. Standard disclaimers: these are projections; they are merely highly educated guesses; etc.
Basically, ZiPS thinks the Pirates need another starting pitcher and first baseman, but that other than that, they're going to be really good. Andrew McCutchen, Starling Marte and Gregory Polanco are projected to account for about 12.5 wins all by themselves, more than last season. It's bullish on a bunch of the Pirates' prospects and depth players, including Alen Hanson (whose top comparable is Jose Reyes), Tyler Glasnow (top comp: A.J. Burnett), Austin Meadows, Keon Broxton, Jake Goebbert, Danny Ortiz and Cole Figueroa.