Have a look at the standoffs in the case, see if they match up. If you're unsure, post a picture of the interior with the motherboard removed.
From what I can find, that case was never released as just the case, only as part of the full Predator system, so I'm unable to find any info on whether it would support micro ATX boards.
There's no logical reason why it shouldn't, but OEMs such as Acer aren't always logical.
I wouldn't purchase the new board until you have confirmed it will/will not fit.
If anyone does have that case, they would of course be able to tell you, but it's not the most common thing around