Sony reveals Pro/Pro-HG Memory Stick at CES
Over at Arena Nikkei BPnet, they posted some pictures of Sony's booth during CES 2007, which shows a roadmap and plans for the Memory Stick Pro Duo.
As you can see if you click on the image, at the very end above 2009, there is a 32 gigabytes of Memory Stick.
There is also a 16GB Pro Duo scheduled for next year. Mind you, all products being shown are ideas and concepts. They may or may not be released. Sony/Sandisk Pro-HG series should be in production this year. The Pro-HG format is a high-density storage option for their Sony devices.
Source: Arena Nikkei BPnet