The PSP Go is going the way of the digital. Apart from the "What about the retailers" question, the more important query is: how much space will the downloadable titles need to nestle safe in the PSP Go's sliding screen arms? Al de Leon of Sony has the answer to that question, and spoke about it in an NYC event.
"600-800MB in size," said de Leon, which would then mean that that 16GB capacity of the handheld (stock) would be able to hold up to 17-18 games. Not bad, right? And you can obviously go for more if you get an extra 16GB.
Of course, the 600-800MB size is not a universal size for all games. There will be those that will require more, while some may require much less.