My Theory:
There was
a leak in late October that suggested a few things that would be appearing in the November Update;
- 3 Day event to hide a mysterious threat.
- A new island in the game world.
- New PVE game mode
- New PVP features
The big one is that third item; my thinking is that the Fractals dungeon represents
an entirely new PVE mode, a randomized dungeon-crawl that gets progressively harder the deeper you go, sort of a hybrid between
Horde mode and MMO dungeon crawls.
Characters who enter this new mode could be stripped of their gear and be automatically leveled to 80, as is the case with sPVP. I think this will be the case because of another panic-inducing feature in the preview; Ascended Gear. If this is indeed a new game mode, it seems obvious that Ascended Gear will be Fractals-exclusive; you can only wear it inside the new mode (or cosmetically when outside it, probably garnering a new tab like the Town Clothes). Likewise, Infusions are the Fractals-exclusive upgrade items.
This would allow for a completely isolated and internally balanced PVE mode so something like Leaderboards isnt out of the question, with players fighting to get deeper and deeper into the fractals. The deeper you go, the more things you unlock for normal PVE play; titles, weapon and armor skins, mini-pets? The potential is unlimited.
That doesnt even take into account that because the new mode is set in the Mists, ArenaNet has free reign to do whatever they want; add a new mini-dungeon into the shuffle every few months? Temporary holiday Fractals? Glimpses into the past or even future of Tyria? The Mists allows ArenaNet a sort of blank slate where anything can happen.
So it might not be just a new dungeon, stealing thunder from the old. Its possibly an entirely new PVE mode that happens to be built around bite-sized dungeon content, but co-existing alongside them. Likewise, Ascended Gear and Infusions are not a new tier of loot we're being forced to chase after, but a completely different gear set exclusive to this new mode.