Commonwealth Bank of Australia will soon release an Android-based Tablet POS terminal. It has many POS functionality such as payment and scanning built in. Third party software developers will be able to develop apps for it once the SDK is released.
http://www.brw.com.au/p/tech-gadgets/meet_albert_commbank_queue_buster_ej2LIKtvRJyx4E3gFJhS3J