First Superbs are the first of a species discovered by normal players.
Due to the limited unfair nature of such a thing, no. They do receive a flashy icon on their profile however, and you'll receive a permanent place amongst the player base in the First Superb List. Provided you never delete the creature, of course.
However, collecting a creature within 4 days of its release will earn you is a substantial Release Reward when the deadline is reached. Go to Information>Release Map for more details.
The majority of normal and premium creatures do as long as it makes sense for them. It's safe to assume that if you can acquire it, a First Superb of a new category member is possible.
You can view the Creature Categories lesson for exact details here.
If you have the credit to spare, there's a couple of categories listed here that offer a chance to race directly for a specific species that hasn't been discovered yet.
Otherwise, the method of obtaining First Superb will vary by their category, and those conditions can all be viewed here.
All new creatures are released at Midnight Server Time, UTC-0. Try to be present during the server daily rollover if they interest you. Check "Community>News" for confirmation of what's been released.