It's probably going to be a while if the comment on the forum is any indication. They have another Acquire game to announce (that keeps getting delayed), and the Steam-related announcement will probably be after that (barring more delays for the other announcement).
It's pretty simple, I prefer vita and psp (playing on bed ) than a pc release.
Yet if pc is the only way to get sc and tc I will borrow a 3 years old notebook to play them.
Heck I would prefer even a iOS version than pc because I am loving portable gaming.
Yet it's all personal taste, if xseed brings sc and tc I'll buy it asap