Japan gets all the good stuff..
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ftfy
We should be getting this by April, if Capcom sticks to their usual release pattern.
I'm not sure what release pattern you're speaking of. I wouldn't expect it in US for at least a year. When it comes to portable MH they tend to wait until "Ultimate" before letting US have it which is minimumly a year out from the original game.
6-8 months is their usual wait time either for a release or at least info on the release. The only exception I can think of is 3U (a few months after the Wii version launched in Japan) and 4U (roughly 4 months after JP release.)
And historically we're far more likely to get it than not. The only unexpanded game we haven't gotten is MH4. And MHX is considered a tribute to the fans, so it'd be a huge screw you to the west not to bring it over.
Then again it's Capcom and they hate the west, so anything can happen.