According to my interpretation of Sony's currently ongoing E3 Press Conference:
PlayStation Plus (The premium subscription package unveiled today) will be free for three months for everyone. And for the first month, WipEout HD will be offered for download for free.
The catch is: you will own WipEout HD for as long as you maintain your subscription, which in the ends costs 50$ per year or 18$ per three months (Which you will need to pay after this free trial.)
This has the potential to bring in much more fence sitters (Why would there be any, well for some even 30$ is a steep price for the whole HD Fury package unfortunately) to the game, and combined with the 3D available now, much more exposure to the game. Most likely much more than it has ever gotten before the release and during these two years that we have had the game (Low marketing, you know how it went.)
This is great news for WipEout, and unlike I was thinking earlier, there might still be hope for something new for WipEout. But before that, Motorstorm Apocalypse must come out...