Looks like Heavy Gear is going 4th edition. No they’re not putting out a GSL version of the game, they’re actually releasing a new edition of their game. Steve Jackson Games and Dream Pod 9 will be selling the new version primarily as pdfs through e23. I’ve purchased some ebooks through them, they’re pretty good. If they were to also Print On Demand (POD) books, I definitely order a few.
More news to follow at Heavy Gear RPG.