And what do you mean by script way then?
Code, instead of JSON/XML, plain code is used.
Basically, I do not mind to create maps, however I wonder if it possible to create complex maps without a map editor of some kind, especially since tiles have a lot of properties. I'm afraid my imagination and short-term memory are not good enough for purely text-based 2d modeling.
Would be a good memory training exercise then

Writing an editor is not hard but would prolly be to time consuming, especially before we see the "endversion" to current exploration system. If it sucks or gets boring to quickly, we may switch to something completely different in the future.
Also, just like with traits and items, tiles will have default values so not everything will have to be filled. Basically, I think that one large advantage of you designing the map in JSON is that you'll have something to do (since most items and traits are ready). Largest advantage of me doing it (without or with limited JSON) is that I can take a number of shortcuts with code that will make a good map for Alpha much faster.
Either way, loads of work remains to be done for the exploration system...