I'd like to see more share to or share this options everywhere. For instance, to share a contact you have to go into contacts but it sends it as an iMessage anyway. Why cant I go into iMessage and hit the camera icon and choose contact instead of photo. Same for your current location. Same with mail. We need an attach file type function.
Alternatively I want share to options to be more prevalent. Why is the only sharing options on YouTube either email or tweet. I want to hit the share button in YouTube and get the same options everywhere, email, tweet, message, etc. Same with safari. I can tweet a webpage but I can't one click send it via iMessage to a friend. I know there is copy paste but meh. I don't want to have to generate a new email message just to copy the YouTube link form it, switch to messages, and send it. Yuck.
They really need a sharing UI that's consistent and then they could make it extensible. Imagine if just installing the Facebook app added sharing via Facebook. Right now apps have to go through this whole sign in and accept the app thing to get that functionality when it could be built in. You add a photo sharing app like instagram and boom, now when you click share on photos instagram is an option.
Also I'd like to see Messages turned into something more like iMessage for the mac is. Add aim, gtalk, etc and then I can uninstall at least 3 competing messaging apps.