I think Aslan should be made 2D, in TLK style. Would be a nice homage to the 20th anniversary of TLK! He should look liek Mufasa
Another possibility is making him played by a real lion. CGI would be way too expensive and they could spend that money on celebrity casts instead!
Jill and the Lady otGK should do mud wrestling! That would add a whole new height of action and tension!
To add some drama, somebody could be injured. We actually don't have to make it a family movie, we need action. Could be P18. The SIlver Chair could be a torture instrument... (I know, it's kind of is...)
We definitely need aliens. The Lady otGK could be an alien! And she's actually good and wants to save the world but
no one knooows it... And everyone wants to destroy her but in the end... *drumms* all become friends, evil Aslan (yesh! that's totally trendy now! Do you know Dark!Dumby HP ffs? Same principle!) is defeated and all of them live happily in a new Narnia wich turns out to be a new Charn... And Charn is actually another planet.
At least one person has to be killed. And one person has to be smooooooched. And there has to be a big love triangle or something like that! And we need teams! Team Puddle, Team Biebs, Team Rilian, Team Eustace... no, wiat. Eustace is a comic relief! He won't get a team. And he will always leaved out in the FanFictions.