Any laptop that meets the requirements can run it. You have to compare the your laptop's specifications to the Diablo 3 requirements.
The requirements can be found at the official Diablo III website.
Yes, Diablo is in Diablo 3.
Yes at high settings to
Yes at high settings to
The system requirements have not yet been announced.
No. There are Diablo 3 teaser videos on the Blizzard website.
Yes it can. But it may be choppy during co-op and if there is rain or snow.
Right-click it, properties, "C:\Program Files\Diablo II\Diablo II.exe" -w <- the target
Mephisto is mentioned, but does not appear 'in person' during Diablo 3.
Diablo 3 is out now, it was released on the 15th of May 2012.
While you can run Diablo III through WINE (a.k.a Wine Is Not an Emulator), you may not want to. There has been a recent story about people getting banned for running Diablo III this way.