This is only for Ritchie fans or lovers not for haters.
Would you be happy if Ritchie returns in BW series or in a new special?
Here is my speculation for BW (I'm very disappointed with writers):
1. I want Ritchie to be the same (I don't want writers to change his personality and make him stupid).
2. I want Ash to recognise him.
And here is my speculation for a new special:
1. I want to see him with new pokemon (Sinnoh or Unova if he is in Unova region)
2. I want see another legendary pokemon episode with him or a non legendary pokemon episode like Oaknapped (Pokemon Chronicles).
3. I want to see him happy. I have no problem with him being sad but I will be more sad if he shed tears and sobs.
Add more Speculations:
Ritchie's pokemon: Sparky, Zippo (Evolve into Charizard or it get went to Oak or his mother care for it), Rose (Same as Zippo/ Evolve into Swellow), Cruise (Same as Zippo and Rose/Evolve into Tyranitar), Happy (Maybe it went to Oak or it went to his mother), Turtwig/Chimchar/Starly (Unknown nickname).
Ritchie's mood: Happy (see above), Sad (see above), Angry.