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Enrique (Kike) Hernandez, Utility:
There aren't many positions on the field that Enrique Hernandez can't play. For the Astros, he played primarily center field, but he also saw time at second, shortstop, and in left. A 5'11 170 lb. rookie who put up solid numbers in the minors, Hernandez was never considered a top prospect but he has certainly turned some heads in his limited time (24 games) in the Majors this season. I'd expect to see Hernandez used by the Marlins primarily at second base this season. His 117 wRC+ with Houston this season suggests success at the plate but it seems unlikely that he'll be able to keep that up. Hernandez doesn't walk or strikeout very much and he's not a threat on the base paths. Kike Hernandez won't be a starter on a playoff team but his ability to fill in at various positions should keep him in the Majors for a long time. Not to mention, Hernandez has some of the better hair in the Majors.
Austin Wates, OF:
If there's something significant the Marlins see in Austin Wates, I must be missing it. Wates was a third-round pick in the 2010 draft out of Virginia Tech. He's already 25 years old, which should be an immediate warning sign. Sure, he has hit very well in the PCL this season (.299/.396/.381 with 31 stolen bases in 331 plate appearances), but who hasn't hit in that league? Proponents of Wates will point to his speed and ability to get on-base. However, I don't see him as a good enough hitter to justify extended playing time in the Majors. Wates has also been held back by injuries for a good part of his career and he's become more of a corner outfielder. Wates is another guy who will spend most of his Major League career as a platoon outfielder or a backup who comes on late in games to pinch-run. When rosters expand in September, Wates could get the call and he's definitely not a downgrade from Reed Johnson, so I'd be surprised if he wasn't in Miami by the end of the season.
Overall, these two players are similar in that neither is a long-term everyday guy at any position. Both could provide energy and a spark to the club in different ways, but you have to ponder if that's all you get after trading away so much.