Along with this fantastic (?) video, Sega opened their new 20th Anniversary Virtua Fighter site. All that's been stated on the site so far is that more news will come in the near future.
From the site:
Since Virtua Fighter has been released it's been 20 years! This is of course thanks to the fans. Thank you so much.
On this site, in order to tell you more about Virtua Fighter, we will update with content over time.
We plan on releasing various 20th Anniversay Virtua Fighter news and contents, so please stick around.
Plans for Virtua Fighter 6? Maybe new DLC content or rereleases? We'll have to wait and see.