Update: Congrats to C! It is indeed Drill Man's theme from Mega Man 4! LBD doesn't count, he posted the story at TMMN! :P

This is so exciting that I had to post this late at night :)

First the good news: This brand new teaser trailer for South Korean exclusive, Rockman Online (which we've discussed before) will blow your mind as it mixes in classic Mega Man characters with Mega Man X characters such as Iris, Alia, and Signas. 

Now the bad news: The game is still exclusive to South Korea. :(

1000 Unity points to the first person to correctly identify the song that is remixed in this trailer!

Protodude Rockman's Corner [via The Mega Man Network]