This game probably got started sometime in 2014. In late 2017, the game was announced with teaser-ish trailer. The game was announced shortly after Sony said they didn't want to announce games too early anymore so that was kind of funny. At e3 2018, the game was introduced at Sony's very controversial e3 2018. It still didn't have much of a HUD, but it showed the gameplay approach they were going for, just without much or any details to give context to what we saw. Despite the lack of gameplay information, it did look very pretty. Sony as a whole skipped e3 2019 and showed the game at the end of the year at the TGAs. The TGA trailer was mostly a cinematic trailer to give more story information, but there was only 15 seconds of gameplay footage with all of it being traversal.
The game is finally coming out in two months but is still being buried promotion wise by the bigger Last of Us 2. Obviously COVID-19 has impacted any preview events Sony would have liked to have done, but it's hard exactly to pinpoint when they could have a preview event for Ghost before the release of The Last of Us 2 regardless as they're focusing on TLOU2. The game has looked fine from the very limited footage we have seen, but this has just been a little bit of a weird promotional campaign.
The game is finally coming out in two months but is still being buried promotion wise by the bigger Last of Us 2. Obviously COVID-19 has impacted any preview events Sony would have liked to have done, but it's hard exactly to pinpoint when they could have a preview event for Ghost before the release of The Last of Us 2 regardless as they're focusing on TLOU2. The game has looked fine from the very limited footage we have seen, but this has just been a little bit of a weird promotional campaign.