I mean the 20th anniversary is basically a free epic trailer.. make a "memorial" trailer of D2. You show Iconic D2 moments. At the end you show something like:
"It has been great 20 years"... the "0" slowly fades out and you show the same trailer in remastered beauty, and bang, D2 remaster. Hype intensifies and everyone is PogChamp. Easiest epic game reveal ever.