Could Ubisoft continue to maintain Ghost Recon Wildlands as a "games-as-service" affair and release this next Ghost Recon as a slightly more traditional experience? All we have to go on is the Skell Technology website (https://skelltechnology.com/skellcon/en-gb/) and the invite to an event called Skell Con. Skell Technology is a (fictional) cutting edge tech company which has been referenced in several Ubisoft Tom Clancy games. "That includes Operation Oracle, as well as the campaign, the Ghost War 4v4 PVP mode, and previous Special Operation missions featuring guest appearances by Splinter Cell's Sam Fisher, characters from Rainbow Six Siege and Ghost Recon Future Soldier, and the Predator". Fans of Ghost Recon will recognize the name as the same company that develops equipment for civilian usage.
However, a world premiere lends to the speculation that this announcement will be much more than just a large DLC or update to an already existing installment in the series. After all, it'd be unusual to hire the likes of Punisher actor Jon Bernthal for what's basically a one-off side-mission.
It's worth noting that Wildlands launched back in March 2017, so the timing seems reasonable if it is indeed getting a sequel.
On May 9 2.30 p.m EDT, Ubisoft will unveil the next chapter in the Ghost Recon series. The SkellCon page's clear use of the Ghost Recon logo is a hard piece of evidence to ignore. Ubisoft is keeping tight-lipped on any details about the new game presently, so we don't know if it's a sequel to Ghost Recon Wildlands or something new entirely.
Either way, there's only a few days to wait until we get the intel.