Keith Law published his mid-season top 50 prospects. It's insider content, so I'll paraphrase for the Cubs' talent that was discussed:
Kris Bryant (Ranked #15) -- Discussed his signing bonus, the obvious question of if he'll end up at third or in right field. Law loves his raw-80 power. Feels like he projects as a middle-of-the-lineup bat, regardless of where he ends up in the field.
Jorge Soler (Ranked #20) -- Law feels like the reps his missing due to the ankle injury will hurt his development, in the sense that he's not able to continue working on making swing adjustments. Still, he loves his high ceiling and his combination of bat speed, effortless power and ability to run the bases.
Albert Almora (Ranked #25) -- His biggest concern is the lack of walks. Loves his plus-defense in centerfield, his overall feel at the plate and the fact that he almost always makes hard contact.
Javier Baez (Ranked #27) -- Law says Baez has the best bat speed in not just the Cubs' farm system, but the entire minor leagues. He feels like his defense has improved to the point that he could certainly stick at short, which could cause the Cubs to move Starlin Castro to either second or the outfield. Loves his power from short, but concerned about him giving away at-bats due to his hacker mentality.
While he didn't profile him, he also mentioned Arismendy Alcantara as a guy placed just outside of his top 50. Exciting stuff on the horizons.