According to a tweet from the Google Nexus twitter feed overnight the $25 Play Store credit offered with the Nexus 7 when you purchase it will be discontinued as of the 30th of September. There is nothing said in regards to the other free content offered in Google Play Books or the Transformers : Dark Of The Moon movie that is also included with your purchase of a Nexus 7, nor the free Music and Magazines offered in the US. The $25 credit has a 1 year expiry on it so you will still have a year to spend the credit if you purchase now.

The $25 Play Store credit was a big motivator upon release of the device to people who wanted to start into the Android eco-system, $25 buys a lot of your basic paid apps and gives you a great deal of extra functionality so ending it is a big step for Google but it has to be pretty expensive to maintain considering the amount of Nexus 7s that seem to be selling just in Australia alone. So go grab one now the Play Store Devices section still has the 8GB and 16GB Nexus 7 in-stock with 3-5 Business day delivery estimates.