I'm talking about remaking wc3 in sc2. WHY?
Well, remaking it would be pointless since WC3 is a good engine and can be customized easily(unlike Starcraft's editor which was limited).
However, there are plenty of reasons to want Warcraft 3 models on Starcraft 2.
One reason is the SC2 editor is more powerful(how powerful, we'll just have to see), while wanting Warcraft 3 units/models or the medieval(ish)/magic theme on Starcraft 2.
So for example, lets say someone made a really good map on Warcraft 3 that uses Warcraft 3 models and the map relies on the "Warcraft 3 theme"(AKA, a space or alien theme like Starcraft 2 wouldn't make sense).
Starcraft 2 comes out, with a powerful new editor that makes WC3's editor look like junk
(though we don't know yet), and that person wants to "remake" their map on SC2 but using the same models/terrain as in their WC3 map.
That's an example of a reason a person might want WC3 models in Starcraft 2.