I just read through - very good ideas! I think the Boarderlands idea can kind of be crossed with the guild ideas - some interesting ones also popped up in the guild proposal thread.
Dragon race - I have serious doubts as to the variation of units in order to make the race playable. Dragons, Big ones, little ones. Drakes... You need a lot more than that. Also, how would cities work? There are so many things that would need to be solved in order for them to be a race that it seems, to me, impractical to pursue it.
Minotaurs - similar to Dragons in the non-development. But, more practal and easier to develop than dragons. I like the druidic idea. Maybe make their race based on minotaurs as workers, basic infantry, etc., but have their major units be very magical - wizards, sea monsters, "dinosaurs" -kindof- etc. Even maybe incorporate elements from the Dragan civilization if it does not work out. Thus you could have a lot of minotaur units [fast, strong, big damage, but expensive] but only a few big ones.