Popplio entries contains a kind of common water; Litten, a kind of fire, watching the cat away (ie a cat); Rowlet and adorable little green fly (clearly the best of the three) is a type of grass and flying owl. Pokemon probably traces the history of the sun, the moon by a large light lion in the form of a bat is to rotate characterized.
The trailer also showed off snippets of the game's graphics, which are similar to those used in X and Y (they're launching on the same system, after all). The main Pokémon RPGs have always been conservative in the graphics department Pokémon X and Y were the first in the franchise's then-17-year history to use 3D models for all people and Pokémon both inside and outside of battle. Sun and Moon's setting, the Hawaii-esque Alola region, appears to use larger maps with a greater sense of scale than in past games, and the region is shown off using more diverse and dynamic camera angles. The game's worlds have all been rendered in 3D since Pokémon Diamond and Pearl hit the DS back in 2006, but even X and Y mostly stuck to the top-down camera view the series has used since Red and Blue on the original Game Boy.
We still don't know much else about the new Pokémon games, which will presumably include a wide range of new monsters and the customary tweaks to the battle system and other longstanding gameplay elements. We do know, however, that players will be able to transfer monsters to Sun and Moon from X, Y, Omega Ruby, Alpha Sapphire, and the 3DS Virtual Console versions of Blue, Red, and Yellow via an updated version of the Pokémon Bank app.