Just to let everybody know, Falcom issued a press release announcing that Ys Seven is not a PSP exclusive. The information was released on April 1st, but I assure you that Falcom was serious. Here's the source of my information: http://seldane.proboards.com/index.cgi?board=ys7&action=display&thread=4309#
I doubt they'll be quite as different as the FNC games. The announcement says the different versions will all feel like Ys games and use the same setting while XIII is trying for one classical, one action-rpg and one that's sort of a fusion of action-rpg and MMO, all set in different worlds (though connected by a similar mythology). My thinking is that VII will be more like the relationship between Mask of the Sun and Dawn of Ys.
I'm not, I'm just pointing out that I very much doubt that the VII games will be nearly as different as the FNC games, espcially since they took pains to say they would all be 'Ys-like' and share a similar setting. You know, like how Mask and Dawn were both quite clearly Ys games that had mostly the same characters and some story elements in common but went in completely different directions in most details.
You seem to have missed the topic title, which says that Ys Seven is no longer PSP exclusive. At first it looked like it was going to be that way, then Falcom announced that they were going multiplatform and that the different entries wouldn't be straight ports.
In general, the PC trend didn't start until Eternal in any case. Before that they were released on a dizzying array of systems (granted, mostly computers) and the closest thing there was to an 'official' system was probably the PCE/Turbo Duo because 80% of the series could be played on it in one form or another.
A PC release of Ys Seven means we might actually get to play the game in English (through a fan translation). I for one am very glad it isn't exclusive to the PSP, as I doubt anyone is going to localize it.