Sony this week announced a new 4 GB model as part of its Memory Stick PRO Duo lineup. The company also introduced a revamped packaging design with colour coding for easier identification of different series. Additionally, products now come with a standard Memory Stick adaptor. The PRO Duo format promises access speeds of up to 80 Mbps and write speed of 15 Mbps. Sony is expected to release an 8 GB version in the coming months.