Where did you see this? I figured they would have a batch of announcements at TGS? I saw the AGES packs got pushed back to sep, but I hope there's news on Sep 1 as well for future games!

I thought that was them just talking about the ones they've already announced, not announcing new ones. I hope I'm wrong though!

Why wouldn't we be?

VF5FS getting a PC port isn't that unrealistic, considering Bayonetta and Vanquish got PC ports many years after their release, and Sega's recent renewed push to put console games onto PC (See Yakuza series for example).
Add to that fact that the game basically already runs on PC (both arcade version which uses PC architecture, and the Yakuza 6 port AND the 360 version is very similar to PC as well I believe) so it would be a simple job to transfer it to PC.
Finally, if they are hoping to eventually release a VF6, it would make a lot of sense to release the previous game in the series on current platforms.

No need for insults, you realise that VF franchise has made far more money for Sega than Bayonetta, Vanquish or Shenmue ever had, right?

As for people asking for a PC or modern port, can you substantiate how many people asked for the other games and then compare it to the people asking for VF? Don't forget on some of the initial pushes from fans for more PC ports, Virtua Fighter was one of the listed titles.

Also, if you want actual poll results from Sega, check out this poll from 2016 where VF ranked considerably higher than Streets of Rage:
http://segabits.com/blog/2016/11/19...eveal-what-franchise-fans-want-to-see-return/

Couple all this with the fact that it would be very low investment to do, and would re-introduce fans to the series, why do you think it's unlikely?

Look at what @Seminasuke said too, the entire fanbase around the world would buy it again on PC/PS4 for convenience sake. This is a game that's already made it's profit a billion times over, it would be pure revenue stream for Sega.

It turned out to be Valk Chronicles on Switch and a demo for FOTNS.