A few thoughts here...
The Aerus Lux Guardian Platinum is/was manufactured by Lux International, which also made the Lux Intelligence and Sauber Intelligence (theses were Guardian Platinum clones that were also available in blue and black colored variants, I believe with varying levels of features). From what I gather, Lux International still makes the Sauber Excellence (a gold-colored version), and the Lux S115 (the "newer" white version).
The white colored Lux S115 has been on sale for several years now in Europe. If the white version was coming to the US, I feel like it would have arrived by now, probably.
To the best of my knowledge, there was a version of the Lux Intelligence before the current black/chrome Guardian Platinum model. If I remember correctly, Aerus and Lux International collaborated somewhat on that model, but Aerus declined to sell it because it was prone to failures similar to the ones you guys are mentioning on the GP. That's why the Guardian Ultra was born... it was a stopgap measure to add a new HEPA model until the kinks in the Lux International model were worked out... but maybe they were never worked out.
So I'm not sure what to think. If Aerus actually has discontinued the GP, I don't know what will replace it. Maybe the S115 if it has resolved the blown circuit board issues? I can't see Aerus designing something new from the ground up, but honestly I wouldn't mind seeing the Guardian Ultra return. I favor the classic look (how many appliances can you buy today that look so similar to something from decades ago?) It's kind of retro-cool, I think. However, a return of the Guardian Ultra would need better HEPA filtration (multi-stage) as well as probably a better sealed interior, a swivel hose at the canister end, and probably a variable speed motor. If Aerus could pull that off, it would be a worthy replacement for the GP. Regardless, I think the Ultra HEPA sealed system and filter need to be retrofitted in definitely the Legacy if not also the Classic, effective like yesterday.