This is a combined system which guides a new player though many features of the game, and leads into a series of quests which allow you to earn money, experience points and pony tokens.
For those of you who've been playing for a while you'll likely notice many quests completing very quickly, and you may find you are presented with section of the tutorial which you are unable to completed. If you visit the new Quests page (Player > Quests) the page will check which quests you have already completed and reward you.
You may need to refresh the Quests page numerous times until all your previously completed quests are completed.
As always, please report any bugs or other problems you experience while completing the tutorial and quests.