Does this mean they're releasing an updated version of the DX Mega Ulorder, considering how the original only has sounds built in for Necrom, Grimm and Sanzo? If Espada x Necrom is going to be a thing, I look forward to seeing Yujo Burst actually winning a fight.

They don’t need to for Yuujou Burst, since it has its own sounds in it, and incorporates the Mega Ulorder’s ‘error’ sound when you try to transform without flipping it around, into its transformation announcement.
If Necrom gets a new form for a new V-Cinema, which I hope he does, it’ll probably just work with the Ghost Driver - like how Grease and Vulcan’s extra forms switch them to the Build Driver and Zero-One Driver.

I would like to say I want Espada to wear Yuujou Burst and Necrom to get a white/black/gold Mugen kitbash so we can have the two stand side-by-side with the same colors.

It’s on purpose why ghost didn’t use mugen and specter used his movie form. Gold gold next. E1 mystery was going somewhere e2 went crazy Stan fan service .