As an admitted droid fanboy and avid user of Android's Voice Actions, I see some major differences in the video, namely: Siri talks back to you. This is something I've always found to be lacking in Voice Actions.
Continuing with your example - you only covered step 1.
- Step 2 - Look down at the phone to verify that it interpreted what you said correctly.
- Step 3 - Press "send", or go back and manually correct it.
- Step 2 - It reads the message back to you.
- Step 3 - Say "send", or maybe you can tell Siri to correct it?
Revolutionary? Maybe not. Evolutionary improvement? Definitely.
Can't wait for Google / Android hackers to copy this. :)