The graphics are beautiful (especially the opening scene) and the music is great, as was expected. Live caster seems cool, and so is more dramatic music when you're low on health.
And some of the new abilities seem very useful. Some of the ones that stood out:
Chlorophyll Venusaur, Solar Power Charizard, Magic Guard Alakazam, Drought Ninetales, Hydration Lapras, Gluttony Snorlax, Hydration Vaporeon, Flash Fire Typhlosion (eruption might destroy the world if you can nab a boost at full health), Drizzle Politoed, Volt Absorb Raikou, Flash Fire Entei, Water Absorb Suicune (it will never die), Speed Boost Blaziken (he might just have a little something over Infernape now!), Technician Breloom (mach punch now rivals Scizor's bullet punch!), Speed Boost Sharpedo, Cloud Nine Altaria, Sturdy Regirock, Ice Body Regice, Iron Fist Infernape (somebody at GF loves this thing), Reckless Staraptor (brave bird + double edge will murder things), Cloud Nine Lickilicky, Poison Heal Gliscor (and you thought Breloom was bulky with Poison Heal?), Thick Fat Mamoswine
And that doesn't even include any of the alternate abilities for the new Pokemon, or any of the abilities yet to be revealed!