Well this is what they said the last time around:
Source:
http://www.polygon.com/2013/7/10/45...s-discuss-the-pc-port-and-eventual-us-release
Since then, they've announced:
1.) A PC version of Dragon Quest X .
2.) Dragon Quest Monsters 2 for 3DS.
3.) Dragon Quest 1-8 for iOS/Android.
4.) Dragon Quest X for iOS via cloud streaming.
5.) Dragon Quest Monsters: Super Light for iOS/Android.
There are two non-multiplatform titles, but they're technically part of the same sub-franchise. Everything else involves porting games to more platforms.