HTC Global issued an update via Twitter:
To resolve Desires memory issue and enable the upgrade to Gingerbread, we will cut select apps from the release.
Look for status updates starting next week. We apologize for any confusion.
It looks like memory limitation is indeed a serious issue for the Desire but its great to see that HTC is taking consumer feedback and giving users what they want. Also it looks like Desire users could have Gingerbread on their devices as early as next week
The take out from this is that HTC looks to be a very proactive company able to take in feedback and decisions quickly based on the feedback. They are really creating a lot of positive public perception for themselves with this exercise.