Important Update: People have reported that the game is actually not available on the PS Vita for the US. Although you can purchase the game if you try very hard, it will not accept to download and install on a PS Vita! The best way to be sure is to buy the game directly from your PS Vita. If it won’t let you, then it means it’s not compatible.
Important Update 2: 173210 has revealed later that he is unable to exploit the EU version of the game. This means the exploit is JP only!!! For people who have bought the EU version because of his announce, he stated he will release a way to create custom bubbles later.
By the way, I’ll give my bubbles you later if you have already bought MPO+ for the EU region.
The game is Metal Gear Solid Portable OPS Plus for EU/US (Metal Gear Solid Portable OPS in JP), and it’s available pretty much everywhere (EU/US/JP). Update: exploit has been confirmed to be available for JP only. 173210 mentions the game is currently on sale on the JP PSN.
In addition to announcing the game, 173210 released the VHBL config file to compile VHBL for this exploit. The VHBL config file itself is useless without the exploited savegame, which we can assume will be released later this week. 173210 is a trusted dev of the PS Vita scene, so this announce can be trusted. Get the game now if you want an ePSP exploit on your 3.55 PS Vita.
173210 has not clearly stated if he will release a VHBL port “only”, or an ARK or TN-V port as well. VHBL lets you run homebrews but no isos, while ARK and TN-V let you run PSP isos as well as plug-ins, in addition to PSP homebrews. Keep in mind that this exploit runs within the PSP emulator on the PS vita, and will not let you run native PS Vita homebrews.