DW Porygon at Nintendo's site
There's going to be an "Analyze" Porygon available soon along with a Porygon C-Gear skin. It is going to come as part of a guide costing 850 yen which will be about connections of some sort. There will also be a Porygon 2 doll available for houses in the Dream World.
It will be released May 18, 2011 and the serial number will be usable until April 26, 2012.