PC World's Game On is reporting that its "sources" have "hinted" at the storage medium for the rumored PSP Go! Refuting the claim that the device will ship with on-board Flash Storage, the blog suggests that it will make use of the Memory Stick HG-Micro format announced at CES, although it's not clear from the wording if that "expanded" version of the current Memory Stick Micro (pictured) is the exact format or just an example.

"Think something like the Memory Stick HG-Micro ... Read more »