Why he's getting picked up by fantasy players:
He's in the middle of a 8-game hitting streak which has included a couple of homers and a 5-RBI game, also having a .372 average and eligibility in a few places (Second Base, Shortstop & Outfield doesn't hurt either.
Where he's been, what to expect going forward:
This is his first taste of major league action and the battle of the unknown is currently going in his favor. He's definitely more lucky than good. While he had higher BABIPs in the minor leagues, there is no way his .372 average/.476 BABIP holds up over the whole season and his minor league numbers indicate to not look to much into the home run department as he never had more than 8 in a season and in the minors, he never had a wRC+ above 113 although he could be good for double figures in stolen bases.
Basically, once pitchers get tape on him to figure him out and figure out that they don't necessarily have to throw him strikes 5.4% walk rate is roughly in line with what he did in the minors, he's likely to be another middle infielder in the crowd. If your thinking about picking him up in fantasy, he may give you a few stolen bases but don't expect too much power or batting average.
Other Things About The Twins that (at least) I find Interesting:
The Twins, while they haven't been great have been better than expected at 31-33 which has them 3 1/5 games behind in the AL Central. They have been somewhat lucky as their expected record (per baseball-reference is 30-34).
The Twins AAA team (Rochester) is doing better at 37-28. The hitter with the most plate appearances is Eric Farris who I sort of remember as he had a couple cups of coffee with the Brewers and spent a few years playing in Nashville and at 806 minor league games and 10 plate appearances appears to be a career minor-leaguer. I also noticed he isn't the only Brewers alumni playing in Rochester (Brad Nelson being the other). Nelson appears to be the consummate definition of the AAAA player as he has 200+ minor league home runs and as the majors are concerned a bust as a prospect (he was a top 50 prospect in 2003 & 2004).
One other thing about the Twins that I at least somewhat pay attention to is the fact that they have two former Cal Poly players on their roster (Kevin Correia & Casey Fien). It always trips my mind that there are some players that are in the big leagues that used to live in one of the same towns that I used to live in.