What is there for herbavores to eat? Are there fruits, nuts, berries and seeds or is it just leaves and grass?
* Unknown, but I would believe there will be fruits, nuts, and the like (don't forget you can eat plants as well).
Can creatures climb?
* Not sure, never saw that.
Can creatures glide? (but not quite have the power to fly)
* Yes.
Being an omnivore is a clear advantage over being a carnivore or a herbavore, because of the versitility in food sources. Will there be some sort of 'price' to pay for being an omnivore (like needing more 'points' to evolve) that would make players be inclined to choose a specialist rather than an Omnivore?
* Game design question, not 100% sure at this point.
What determines heat and cold tolerances of creatures? I would hope the creatures on a tundra planet would look different than those on a desert planet.
* You do (in theory). If you make a creature with thick fur a lot of muscle mass you might "appear" on cold planet once you leave the water. Same thing with heat. Creature types will populate the planet based upon the planet specs (i.e. on ocean planets you'll find a ton of water-based creatures and some land-based).
Will mentioned that the tribal stage would determine how emotional/logcial a race would be. I'm wondering what the exact effects of emotion vs. logic will be. A logical race could just as easily be peaceful as it could be warlike. Same goes for the emotional extreme.
* I believe that this will be a bit more simple than you describe, and a bit more complex. Such as if you are a logical/peaceful race you can fight, but you won't be very good at fighting (but you will be very good a diplomacy). Every race can do everything, but some will be naturally better than others because of their culture/emotions/logic.
It was said that when you become sentiant you would control only one of several tribes of your race. How many is "several"?
* Unknown, game balance question.
What are the social ramifications of being a solitary vs. a group creature when they evolve sentiance. Even 'solitary' creatures begin to live in groups, do herd creatures act differently?
* I do not know, only saw social creatures.
In the video, the agressive city also had Will's tripods living in it. Is it possible to have OTHER races on the same planet at the city stage?
* No, once a single race become the dominate speices they "take over" the planet and become the top of the food chain on that planet. There will be other races on the planet, but only one dominate speices.
When Will was doing the first contact light show, did they attack him because they were warlike, or because he screwed up the message?
* It could have been either! It will take time to figure out how to communicate with other speices. Will could have also given them a "gift" instead of blowing them up...
Since you need to mate to lay an egg on the animal stage, there must be others of your species. How many other members of your species is the world populated with? Does the number increase as you become more successful and decrease as you get killed?
* Not sure.