You have to buy the game. After the initial purchase, it is free. There are no monthly fees besides the optional RMAH.
Yes, Diablo is in Diablo 3.
No, it is not pay to play. The only cost is the one-time price to buy the game.
It costs $9.99 from the Diablo 3 official website. I bet you can find it even cheaper from other places as it's pretty old now.
You just need to buy the game. There is no online fee. It is free to play. Diablo 3 is free to play. There are no monthly fees unless you decide to use the RMAH.
No. There are Diablo 3 teaser videos on the Blizzard website.
Mephisto is mentioned, but does not appear 'in person' during Diablo 3.
buying the diablo 2 battle cheats whit the lord of destruction expansion pack i down lode diablo 2 and lod of destruction it has the lord of destruction background but im playing diablo 2 and it has the diablo 2 icon and i can get in to battle.net it say it can identify the application of this version
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
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.