As for the rest of the games in the series, which is commonly referred to as the Final Fantasy 13 Trilogy, those are tipped to roll out later next spring, but all that you really need to remember for now would be to key in October 9th on your respective calendars, digital or otherwise, in order to make sure that you would not miss out on all the fun when Final Fantasy 13 arrives on the PC.
Just a little bit of trivia here – the whole Final Fantasy 13 series comprises of the original game itself, alongside 13-2 and Lightning Returns, and they have shipped more than 11 million units around the world, making it successful in its own right.