While we wait for official apps from companies we make due with 3rd party solutions. However, a lot of the times we get some great apps from the Windows Phone community and it's really hard to see what else an official app can add. You only need to look at 4th and Mayor and Metrotube to see examples of the active development community.
You can go ahead and add Starbux Card to that mix of examples. If you want to load up your Starbucks cards to your Windows Phone, check out Starbux Card for Windows Phone 7 and 8.