Windows Phone Thoughts: Windows Phone 7 Keyboard One of the Best

CNET Asia has posted a video focused on the keyboard in Windows Phone 7 and has come away incredible impressed. The editor found the keyboard to be "very fast and responsive". The keyboard will support multiple languages (English, French, Italian, German and Spanish) at launch, but will lack Asian languages (Chinese, Japanese and Korean). These will be added at an unspecified time after launch. Overall the keyboard is said to be second only to the Apple iOS keyboard. What could be holding it back from being considered the best keyboard out there?