Here's a cool breakdown of features that the new Droid Incredible 2 has over its ancestor the OG Dinc. To simplify things, the following will just be a list of things that are only found on the new phone, or a quick comparison.
- Global Phone with support for voice service in over 220 countries, data in over 200 countries, and 3G speeds in more than 125
- 4" SLCD screen vs. 3.7" AMOLED
- A front-facing 1.3MP camera
- 768MB of RAM vs. 512MB
- 16GB internal storage vs. 8GB
- 1GHz 2nd generation Snapdragon MSM8655 with 45nm technology vs. Snapdragon QSD8650 processor with older 65nm technology
- Sense UI 2.1 vs. Sense UI 1.0
- 1450mAh battery vs 1300mAh battery
- DLNA streaming
- Incredible 2 is a bit larger and heavier
Source: AndroidPolice