So I beat Queen Fungi (whatever her name is), and got the ending cutscene and ended up in that Bad Scrabble Hand named city. But due to some issues messing up the mod installation (I tried to install KotBL mod and really screwed it up), I ended up having to wipe it. I figured, ehhh, already beat the BBEG, so why not just clean slate it for the Keep installation. How much content did I miss by doing this? I figured I was about 95% done with whatever there was to see, as I cleaned out every level and node, and my characters were circa 15th level. Although I really expected a lot more bonus content, since the only areas I had available was Hommlet, Nulb, that clearing near Hommlet, the old Battlefield, The Moathouse, the Temple itself, the swamp area north of Nulb, and the ogre cave. That was it. I noticed re-installing that the instructions (which I didnt read natch) said it is important to turn off the map update option, which I didn't do. I wonder if this stopped me from getting access to the new content. All that said, the TLDR version, if I ended up in the V city after beating the fungi queen and end cutscene, and I've cleared the locations I indicated above, how much more was there to explore, that I missed? Trying to figure if its worth it to give it another go from scratch to see...
I'd definitely recommend having another go and playing the new content. Despite the limitations of a game engine only designed to go up to level 10 and it being a cRPG, Co8 new content adds an awful lot of interest. There's nothing like the Temple as an extended dungeon crawl, but there are a number of new quests that work well as a series of 'one-shot' tasks that your team ought to be able to achieve in one outing. There's a bit of flexibility in terms of which tasks to deal with first-- some things are linear but there are different threads so while you don't get asked to do B before you've done A, you do get to choose if you do big battle X before Y (which has an effect on what level you are at each challenge). I'd say 2 decent sized dundeon crawls, 3 or 4 decently challenging skirmishes, 2 quite prolonged bits of intrigue/investigation, and 2 large running battles. There's also some interesting interactions if you can get them to trigger. The addition of new feats, prestige classes and spells mostly via Temple+ makes the combat side of things remain interesting.