I respectfully think there are some information errors being posted, due to the spec sheet and the manual posted. I joked earlier, but interns seem to really be putting the information together and nobody is supervising / reviewing the content (usually the product manager's job in marketing). Then again, the device has not been officially released, so perhaps the info is not ready to be published.
1. Very doubtful 8gb is built-in. Why would HTC make two main circuit board designs for the Desire and Incredible? HTC would not be so cost-dumb for production. 8gb is probably a micro sd card.
2. The ram is 512mb or 576mb. Why add 64mb, unless Desire will also see an engineering rev change?
3. Flash Lite probably is on the device and 4.0 makes sense
Please note that both the "i" source has errors and repetition and the manual has errors too. Neither source can be considered a "trusted" source for information as a result.
Let's hope the quality of the device is better than the current reference materials
Update: BLD, I think your suggestion makes sense in regards to chip die verses memory module and the 64mb.