This is basically what I was thinking, regardless of what happens. Even if it's fully intended to be AA3 or it's successor, it's most definitely not going to directly be called "Artificial Academy 3"/OG JP title, but 3. In my opinion after staring that footage down for longer than I probably should have, no matter what, it is BLATANTLY taking after AA.
• Pre-rendered backgrounds + fixed camera angles (which kinda hurts ngl, after 10 years I would've loved to have fully 3D like in Koikatsu.)
• Buttons along the top right of the screen likely representing the "Everyone!" options + locations & students (and teacher??)
• Possibly low poly models running around the world again (again, kinda hurts, especially since they look to be AA-style low poly instead of again, what Koikatsu did.)
• An ESPECIALLY big differentiation from Koikatsu's "all girls except you" school format, male students are back
• The above opening up all sorts of possibilities lost between AA/AA2 & Koikatsu, hopefully such as proper interactions and relationships between NPCs, and those also affecting you in return, etc.
• Even the pink and blue style is seemingly coming back with the textbox seen at the end of the teaser, not to MENTION the full high poly character view when you talk to them.
A lot of this surely goes/went without saying, but in case the comparisons weren't drawn out yet, this literally to me can't be anything but. The gameplay is already at it's core looking to be identical. All that's left is seeing what new additions they can come up with. It's been 10 years. 10. Years.
I can't help but to hope that this ends up, after all this time, being AA's AA3 to ILLUSION's previous AG3 that would get raved about long ago as well. I also hope that the ABSOLUTE worst thing about this is that it's IL2CPP, because I'm hoping that it being AA3/Successor/whatever will finally be what it takes for people to be inspired enough to really try this time around.
That said, no matter what once again speaking here, at least we get Koikatsu/Honey Come level character customization, so this should be REALLY good at least too!