I had a dream where I think there was an event to celebrate 20 years since the fma 03 anime, and they showed these two trailers.

One was brotherhood based, it just felt like a clip show of the whole series but there might have been hints of a new ova or something at the end, definitely a few new scenes that got people excited.

But then the second trailer... It was presented with the same structure as the brohood one of an overview of the whole 03 series, but when it got nearer the end, things got different. There was a weird break where the Dante confrontation happens and lots of dramatic voice overs of the brothers calling for each other and alchemy things happening, and then it suddenly switched to a new animation style that was like a mix of 03 and brohood. Ed and Alfons were in the Amestris world this time. Ed looked a bit taller and was dressed like post-brohood Ed, and Alfons had slightly longer hair. The other military characters all seemed to be shown as if they were now civilians with no uniforms on. Mustang was shown the most, working on devices using fire alchemy to heat things. There was voice over of them having conversations about how long Al had been missing and Ed looking for him, playing over clips of Ed and Alfons looking around different new cities and I think what was Xerxes ruins? Some deeper voice asking "Do you know who that guy really is?" and showing clips of Alfons from different situations with various levels of suspicious or not suspicious expressions. Lots of random visuals with dramatic out of context lines. And then for the last clip it was Al looking very determined and about to fight a lot of things approaching off screen in some ruined looking place. He also looked a bit older than in CoS and wasn't wearing his Ed lookalike outfit.

Annoyingly I can't remember much more but it was definitely meant to be instead of CoS happening, maybe even a little later? I'd guess it was a retelling where Al's sacrifice sent him to another different world instead while somehow also giving him his body?? I'm so curious what was going on and what was Alfons's deal man I'm so mad by brain only produced a teaser