To those of you saying that it's a bad idea for them to skip PS4 - how do you expect PS5 to overtake PS4 if we never leave it behind? We're almost 4 years into the gen. I think it's time to let last gen die already, even if it's something simple that can run on the last gen hardware. I see it as just another reason for people to upgrade to PS5s.
As for this announcement... I've seen some speculation that they may have gone ahead and included DQ 1 and 2 in with 3, making it a seamless experience while playing the Erdrick trilogy. That could explain why we've had 3 years of complete radio silence after DQ3 HD-2D was announced, since it could potentially be larger in scope than they initially planned. It could also explain why the video in the tweet says "The legacy begins." The YouTuber Davidvinc RPGs made a video about this and he included a snippet from the DQ3 HD-2D announcement from 3 years ago, in which Yuji Hori seemingly went off script and was alerted via an alarm when he mentioned how they should remake DQ 1 and 2 if they're going to do 3. I really hope this is the case because I never played those older Dragon Quest games, and I have adored all the HD-2D RPGs I've played so far and would gladly buy as many as they're willing to release as long as the quality is as high as it has been for stuff like Live A Live and Octopath.