Im even too lazy to check bookmakers quotes, but Im sure that Bayerns odds for the title this year have returned to ridiculous values like 1.05 again, although formally Bayern is not in first place now and there are many competitors nearby.
Yes, very close: 
Even Dortmund and Leipzig are ranked higher. Champions Leage is best Union can realistically achieve. But I wouldn't be surprised if Union can finish above Dortmund and / or Leipzig.
Union Berlin should have won easily against Bochum but in fact Union Berlin could not make the fans happy, many fans were disappointed with this defeat, hopefully in the next match against Braga Union Berlin will get a win and not make himself hated by the fans. Union Berlin still has hope of a return to the top spot and should succeed in getting it.
This is a big surprise to see that Berlin was lost from Bochum. Does this seem that Berlin was not seriously fighting against Bochum in this match and probably underestimate the club? But, why? So, Bochum lost in Frankfurt and only got a draw in Mainz, while most games at home were won by Union Berlin. "Only" against Bayern and Leipzig, Union achieved a draw at home.
Union has been playing very well at home while experiencing some difficulties away.