In the context of the PlayStation Vita’s legacy, the mention of "VPK" refers to the file format used by the homebrew community via the Henkaku exploit.
Shrinking a high-octane, sprite-based fighter to a handheld often results in visual compromises. However, on the Vita’s OLED or LCD screens: BlazBlue Chrono Phantasma Extend PS VITA VPK ...
It signifies the transition of the Vita from a commercial product to a community-driven "legacy" console. The Chrono Phantasma Experience In the context of the PlayStation Vita’s legacy,