Mephisto, who is the God of Hatred, is the oldest, Baal, God of Destruction, is middle, Diablo, God of Terror, is youngest.
Yes, Diablo is in Diablo 3.
The final monster in the Lord of Destruction expansion pack, is the Prime Evil, Baal, brother to Diablo and Mephisto, who you defeated in earlier chapters.
No. There are Diablo 3 teaser videos on the Blizzard website.
Diablo 3 is out now, it was released on the 15th of May 2012.
No, there is no pirate class in Diablo 3. If you mean to pirate the game, you cannot do that either.
diablo 1 is about 100mb diablo about 800mb and diablo 2 expansion another about 800mb
You really can't find it. You can do magic find runs at certain areas, like Mephisto. They are simply a random drop. Your best bet would be to trade something for the set.
It's been over 13 years since Diablo 2 was a true Hype, so this would give you a perfect reason not to worry if Diablo 3 would be your 1st Diablo game experience.
Diablo 3 was released on May 15, 2012.
The requirements can be found at the official Diablo III website.
The cast of Mephisto - 1912 includes: Alfred de Manby as Mephisto