Haha. Well, the list of new Pokemon is vast. In total, the Unova region has brought 155 new Pokemon! Most of which have made it into my top 50 favorites. c:
They vary from the Psychic type Munna that you had seen, the Normal type Patrat, and the Psychic-Fire dual type Legendary Pokemon, Victini. A full list can be found here.
As for the new battling features:
There are two new types of battling. The first are Rotation Battles. These are essentially 3-on-3, 1-vs-1 battles. The trainers each send out three Pokemon, however, only one Pokemon battles at a time. While the Pokemon are out, you have the option of rotating the Pokemon, and then selecting an attack. The opponent gets to do the same, so working with type advantage can be pretty difficult in these battles.
The second is a basic Triple Battle. These are just like Double battles, but with three Pokemon.
The Pokemon are able to attack any adjacent Pokemon. Pokemon in the middle have free range to attack whoever, while the Pokemon on the left can only attack the middle Pokemon and the left Pokemon, and the Pokemon on the right can only attack the middle and right Pokemon. There are a few moves, however, that can hit anyone, regardless of possition. Many Flying-type attacks are included in this, as well as Aura Sphere, Water Pulse, Dark Pulse, and Dragon Pulse. Perish Song also affects every Pokemon.