The App store is great. Its easy to use and has plenty of apps available to choose from. Something the store is lacking is trial periods. The Google Play store offers refunds for purchases. Say you download Angry Brids and you hate it or your child inadvertently downloads a $20.00 app. You can get a refund with in 15 minutes of the download. However once you pass the 15 minute mark or re-download the app you will be charged and you will not be eligible for a refund.
There are a lot of iOS users out there that would like to have trials available to them. Some developers offer “lite” versions of their apps but that doesn't always satisfy the user. It also causes more work for everyone. The developer has to make 2 versions of the app, Apple staff has to maintain additional data and users have to search through more apps. Apple would not have to wait until iOS 7 to implement this feature. They could release it in a 6.x.x update but I doubt that would happen so close to WWDC.
Amy Worrall, a Mac & iOS developer from the UK has a good idea: “ Developers can choose whether to allow a trial of 1, 7 or 30 days, or to disallow trials all together, on a per-app basis. For those apps that allow trials, the App Store would show a “Try for 7 days” button alongside “Buy app”
Check out her full idea on her blog.