This is related to game modding how?Nothing presently requires upgrading to 3.67 in particular. Sony has been signing games for 3.65 as of late, probably thinking that that's "good enough" since the community doesn't have any way to bypass the crypto used by later versions of the Vita firmware. Most likely, when TheFlow releases his tools next year, it'll just have you update to 3.65 using a PSP2UPDAT.PUP file.
Of course, that's also kind of a "good enough" situation, but unlike Sony's thoughts there, it might ACTUALLY be good enough. It's entirely possible that 3.67 doesn't even add any new signing keys over 3.65, and that that's why releases only get signed for 3.65+ instead of 3.67+. We won't know 'til we get there.
In 3.67 we lost access to decrypted files in the patch folder meaning modded games won't work anymore, even on 3.60 no one is willing to help create a plugin to make modding the eboot possible allowing for game mods that require it.
From the looks of it if anyone wants uncensored/undubbed/English patched modded games then they are better off waiting for it to be released on PC.