The game will very likely be on Steam. The release prices aren’t fixed yet. They won’t be AAA fullprice game price that’s for sure. Also, no supscription will be required. Once you buy the released game you can play as much as you like.
Infinity:Battlescape has a Chinese site! http://www.infinity-game.com
You can find more Information there as well as fellow followers. @freeman is the lead over there. He could answer some more question in your native tongue.
Don’t hesitate to ask anything else if your are interested in some aspect.