Yes and no...
Most of the game has not changed, however some of it has.
Since the introduction of arcade, new arcade functionality was added to maps that your map would not have. You would need to add this to your map for it to appear professional on the arcade system.
Many new natives, data classes and even catalogs have been added since WoL was released. To take advantage of this new functionality you will need to add elements that use it to your map.
Finally the behaviour of some elements have changed slightly (some times fixing bugs, other times to make it easier to use) so you may find the map has some compatibility problems with newer versions of the game that require fixing. Specifically actors are known to have this problem as more extensive warnings were added in later patches. A map should have no warnings (when possible) as a warning generally shows something being done wrong.
HotS uses the exact same editor and game as WoL, in fact all WoL players have the HotS data installed on their system and only require a licence to access it. If a map is WoL compatible it will run perfectly for both WoL and HotS players. Only if you explicitly bind a map to HotS mod sources will it become exclusive to HotS players.
HotS mods offer more models than WoL (as it includes all WoL data) as well as improved models (take advantage of the new physics system) over those WoL gives. Additionally HotS melee will be the melee standard so you can expect no (or few) melee changes to WoL from now on.
