Differences Between 하군요, 하겠군요, 하네요
Hello,

I wondered if anyone could help me clarify the difference between these similar grammatical structures. I understand that the are all exclamations in reaction to new information, but i can't quite grasp the subtle differences.

Here are my initial guesses:

재미있군요 - I realize that it is interesting! (an exclamation based on evidence)
재미있겠군요 - I suppose that it must be interesting! (an exclamation based on supposition, rather than evidence)
재미있네요 - I realize that it is interesting (I expected it to be boring)

그 사람 열심히 공부하는군요 - I realize that, based on evidence, that person studies hard.
그 사람 열심히 공부하겠군요. - I suppose that that person studies hard.
그 사람 열심히 공부하네요. - I realize that that person studies hard (I expected the opposite)

As always, any help will be greatly appreciated!

Question

Differences Between 하군요, 하겠군요, 하네요
Hello,

I wondered if anyone could help me clarify the difference between these similar grammatical structures.  I understand that the are all exclamations in reaction to new information, but i can't quite grasp the subtle differences.

Here are my initial guesses:

재미있군요 - I realize that it is interesting!  (an exclamation based on evidence)
재미있겠군요  -  I suppose that it must be interesting!  (an exclamation based on supposition, rather than evidence)
재미있네요 - I realize that it is interesting (I expected it to be boring)

그 사람 열심히 공부하는군요  - I realize that, based on evidence, that person studies hard.
그 사람 열심히 공부하겠군요. - I suppose that that person studies hard.
그 사람 열심히 공부하네요. - I realize that that person studies hard (I expected the opposite)

As always, any help will be greatly appreciated!

Answer

-군요 and -네요 have almost same meaning and are used as showing wonder and exclamation for new information.
But, -네요 has a nuance of  a little stronger feeling of wonder and exclamation than -군요.

재미있군요 - I realize that it is interesting! (an exclamation based on evidence)
재미있네요 - I realize that it is interesting! (an exclamation based on evidence and stronger feeling of exclamation than 재미있군요)

재미있었군요 - I realize that it was interesting! (an exclamation based on past evidence)
재미있었네요 - I realize that it was interesting! (an exclamation based on past evidence and stronger feeling of exclamation than 재미있었군요 )

재미있겠군요 - I suppose that it must be interesting! (an exclamation based on supposition, rather than evidence)
재미있겠네요 - I suppose that it must be interesting! (an exclamation based on supposition, rather than evidence  and stronger feeling of exclamation than 재미있겠군요)

그 사람 열심히 공부하는군요 - I realize that, based on evidence, that person studies hard.
그 사람 열심히 공부하네요. - I realize that that person studies hard (stronger feeling of exclamation than 공부하는군요)

그 사람 열심히 공부하겠군요. - I suppose that that person studies hard.
그 사람 열심히 공부하겠네요. - I suppose that that person studies hard.(stronger feeling of exclamation than 공부하겠군요)

cf. There is no correspondence of 더군요 
재미있더군요 - I realized that it was interesting! (an past exclamation based on evidence)
그 사람 열심히 공부했더군요 - I realized that, based on evidence, that person studied hard.