Well sony also did that with PS3 n Vita version of cold steel 1 and 2, but it did get ported to PC by Xseed later onSpeculation: it might be related to the fact that Sony is localising both Cold Steel 3 and 4 into Korean (and possibly Traditional Chinese as well). I wouldn't be surprised if they attached an exclusivity clause to that deal.
http://www.siliconera.com/2014/01/27/sony-localizing-legend-heroes-trails-flash-series-chinese/
I'm not gonna deny by saying such deal couldn't be possible. It's probably one of the reason why Falcom keeps releasing games on sony's platform by their in-house development team and leave porting to other companies. Sony Japan Asia branch helps them localizing their games to big Asia markets where their games sold the most.