Well, they've said multiple times that it's basically a reskin sitting on top of the old game running underneath which is why you can flip back and forth with a hot key. I have no idea what that means to a software engineer, but taken literally, it'd mean no bug fixes, improvements, or changes other than an art overhaul.
Where on EARTH did you hear that. Legit, who told you that.
They already openly said that they're fucking with the base game, and that their goal was - IN THEIR WORDS - to keep it '70% intact'.
There's a whole host of changes besides the art.
BESIDES removing TCP/IP support, they're fucking with the UI, they're making it 'accessible', screwing with all of the base sounds in the name of 'modernizing' them, changing the graphics of a lot of spells and skills (NOT just updating them - totally changing the visuals) and are 'rebalancing' a whole bunch of skills and items.
And that's not even talking about like 'cross-progression', 'shared stashes' and things like auto-loot, and even more SJW bullshit about how they need to make it 'accessible' for disabled people. <---- That is real, that is something they said 'concerned' them.
The idiots 'remastering' this crap have no idea how or why the original is so popular, so they're screwing with whatever their Twatter bubble of idiots that never played the game tells them are 'problematic'.
As I said in the WC3 thread, this is going to end like the idiot bint that decided she was going to 'fix' a masterpiece painting of Jesus on the wall of a church.