That's the thing they officially revealed mega stelix and mega glalie as the demo was getting out, so yes they revealed the supposed last mega evolutions on their own instead of being the leaks doing it.
That's the thing that makes me really hard to believe the demo has everything on it, because they never did something that not to mention they are reusing some artwork from X/Y?
They also never did that, every remake they always changed the artwork from within the same generation.
The generic trainers sprites from fire red/leaf green are all different from the Hoenn games and the same thing happens with hearth gold/Soul Silver and the Sinnoh games.
Even the same classes like the hikers and so for it they always change them.
Hell even the freaking swimmers are always different and those guys always use a cap with goggles and a tong.
But they probably didnt create the megas as they were revealed, they only revealed the Mega Latis this month and they were in XY data.
In other generations the new pokemon in the third games or remakes were forme changes and those forme changes always got revealed before it came out, ofc its just 1 or 2 not 21 like we got with megas.
The engine is the same and they probably didndt remove they just have the data from XY there or some data for other reasons.
Yeah but this are actual 3D models now they aren't just going to remodel everything its not like its a huge shore but its harder than the sprites.
Well we will see in 10/12 days or so like I said hopefully I'm wrong.