If you are not on Wifi, make sure you allow Cellular/Mobile data for those services in Settinigs
Im running into this as well. On wifi I can go into the App store or iTunes and purchase items but they never download for me. Its been 2 hours and its still trying to download an app - I've restarted, forced re-boot, you name it. It eventually tells me it was unable to connect (Im guessing it means the server they download it from, since Im able to browse the store etc).
Phew! Glad it's not just me.
Where do you go to file a bug with Apple?
Well i have itunes radio back but my itunes store app is still crashing as soon as its opened