Take this with the largest pinch of salt that you can find, but a Japanese magazine is rumouring that the reason for the 3DS delay of Monster Hunter 4 is so that a PS Vita version can be released at the same time.
"Whilst originally it was said that the delay of MH4 was due to wanting to make a better quality game and graphics, the real reason appears to be that it may be released on the PS Vita to increase sales," says the rumour via Operation Rainfall.
Capcom hasn't announced a Vita version of the popular series is in the works and we really aren't sure they'd be able to get one out this quickly, unless of course it's been in development for quite some time. But if so why would Sony keep quiet about it?
Given that a Monster Hunter 4 title would more than likely revive the fortunes of Vita in Japan, Sony would surely love this to be true.
In our opinion though you should file this under hopefully but doubtful.