On October 20, Sega revealed on the latest PSO2 Station+stream that Phantasy Star Online 2 is getting a crossover event with Sword Art Online. Only the Japanese version of the game though. Maybe it'll come over one day in the global version, but nearly all of the collab events that happened since its launch didn't make it. So I wouldn't get my hopes up if I were you.The Sword Art Online crossover in PSO2 will be happening in December 2020, it'll add avatars for Asuna and Kirito, weapon camos, and Lobby Actions. Asuna and Kirito will also appear in the game. The crossover was teased with a short trailer, featuring a key visual with Asuna and Kirito, and Matoi and Ash from PSO2:

Note that it looks like SAO illustrator Abec / Bunbun drew the key visual, but there's no official confirmation yet.

PSO2 has been out for eight years now, and SAO has been one of the most popular Japanese franchises since the early 2010s. It's actually surprising this didn't happen yet. Especially seeing pretty much every other popular anime thing has been in PSO2 already, from Evangelion to KonoSuba.

Another trailer has been shared as well with upcoming updates to JP PSO2. The Halloween 2020 event, new costumes etc. If you're actually playing JP PSO2, I'm sure you've already checked everything anyway or read translations on a certain bumped blog, so I'll just leave you with the trailer:

As a side note, new collab events with Hatsune Miku and Senran Kagura were announced too:

Additional details on the PSO2 x SAO collab event will be coming on the next PSO2 Station stream.

In 2021, Phantasy Star Online 2 will get a huge update called New Genesis. It's pretty much a new game within the game. The latest information on PSO2 New Genesis was revealed at TGS 2020, with new gameplay.

The Japanese version of PSO2 is available on PC, PS4, and Switch via Cloud. In the west it’s on Xbox One, Xbox Series X, Windows 10, and  Steam. PSO2 NGS is coming to the same platforms on each respective territory, seeing it's accessible ingame and not a separate entity. PSO2 graphics will be enhanced to match PSO2 NGS too.

The latest SAO game is Sword Art Online Alicization Lycoris, available on PS4, PC and Xbox One. An anime adaptation of the spinoff Sword Art Online Progressive was announced in September as well.