Please don't go the IPL route, I'd prefer to have more proper domestic structures for example NZ than the IPL.
The IPL would surely involve making a whole new structure, but to make NZ and SA you would just need to use AUS as a base, as all three have six teams.
Not to mention I least enjoy playing T20's, so I would hardly even play the IPL.
I don't really have a problem with the interface or graphics, like Sureshot said it's better if more of their time goes into more in-depth feature changes.
Kind of like Chewie I just have my highlights set to wickets, so I don't really get time to worry about what kits they are wearing. As long as they're all the right colour it's fine with me.