pomalley: What's the best way to get started with New Horizons? I see a link a couple posts up to the English version, so I'll grab that. Here are my specific questions:
1) Will this overwrite my current game/campaign? (I have the GOG version of Genesis.)
Yes and no :) . Your current games are in the "save" folder and will not be overwritten by installing the mod. However, due to the fact that an insane amount of content is added by the mod your vanilla games will be incompatible. You will have to start a new game/campaign.
pomalley: 2) How is the (English) translation? I found the Genesis translation to be great, but I don't necessarily expect a mod to be as good. I don't know a single word of Russian. :-)
High quality translation, most of the English content was created by a professional translator.
pomalley: 3) Should I start a campaign or go with custom games?
Start a custom game if you want to experience all creatures/ buildings unlocked. BTW, new release should be out this week, so you may want to go with custom maps for now anyway to avoid losing campaign progress (new version contains new orcs/gnolls, saves will be incompatible with current version)
pomalley: 4) I looked around a bit and couldn't really find anything telling me what's what. Is there anything in particular I should be aware of? For example: "the difficulty is increased", "it is even more important to keep your units alive", "it is more/less easy to mix good and evil units", "Karma is more/less important", etc etc.
please check out
http://steamcommunity.com/app/235660/discussions/0/483366528899208084/