The costs of future installments of SF V will be minimal, due to the company using the same engine & models, etc.
It's just like every other game that gets an upgraded version.
The main difference here is that a Japanese developer actually has legitimate business points in making an exclusive for a Japanese based system. Same for Western Devs and an American based system. Capcom of Japan gave PS4 Deep Down, Capcom of America gave XB1 Dead Rising 3? See how that works? Insomniac gave XB1 Sunset Overdrive, and Atlus gave PS4 Persona 5. Again makes sense. What western third party gave the PS4 an exclusive? None. What eastern third party gave an XB1 exclusive? Platinum Games and Square Enix. You can tell who has more influential cash flow when devs make questionable business decisions away from their own regions.
Also, certain genres simply sell better on PlayStation consoles, to the point where putting them on other consoles isn't even worth it. This is why JRPG's are the exclusive domain of PlayStation. Sony doesn't pay companies like Compile Heart and Nippon Icchi for exclusivity, they're exclusive because the Publisher already knows that their games won't sell on the XBox platform.
Fighting games have always been debatably more popular in Japan than America, and PlayStation is the leading console for Japan (and Japanese-genre players in other regions) outside of handhelds for genres like that. With Capcom being strapped for money as we know they are, Developing solely for the console their game is going to sell the most (and has a vastly bigger install-base) on makes good business sense.
Looks like you were never around during the 8-bit, 16-bit, 32-bit/64-bit, or the 128-bit eras of consoles in where there were plenty of 3rd party exclusives going around between all of those systems before the Wii/PS3/360 era.
