Widescreen support, integration into the modern Battle.net, and full compatibility with current operating systems (i.e. not the current situation where the software itself functions on Intel-era macOS/OS X, but there isn't a working installer) were pretty much all I was asking for. It's nice that the first of these has finally been addressed after years of expectation. The models and art themselves have aged and scaled to modern resolutions rather well, so while I'd appreciate a remaster down the road I don't feel any particular urgency for it to happen. And even then, I wouldn't expect much: a fresh pass on the rendering/scaling of the pre-rendered cinematics (as in SC:R), revised interstitials to bring the map artwork in line with the post-WoW "canon", but not a whole lot else to justify the "base game is free, fresh coat of paint is $15" model SC:R pursued. We'll probably get that eventually, just to bring in revenue and new players, but realistically I don't see how much it will have to offer—whereas sprite-based titles like D2 are in far more urgent need of artistic attention from the classics/remasters team when it comes to scaling old games up to HD.
If you're interested enough in revisiting the game to be begging to pay for a remaster, I don't see why you're not already playing WC3 now after the new patch. You don't need to pay for it twice, either, as registered CD keys from the original release of WC3/TFT are still good on Battle.net for flagging your account as eligible for digital downloads. Widescreen and support for modern resolutions were the biggest hurdle the game needed to clear in terms of aging decently. That's what I was waiting on myself, as I've been wanting to get back to WC3 multiplayer and learn it properly (even at a casual level) now that I have far more RTS experience on my belt than I did 15 years ago.
The improvements to UMS, meanwhile, are going above and beyond. Certain party games and co-op TDs would be absolutely crazy if scaled up to larger maps and 24 players.