Here's the latest from HTC:
To resolve Desire's 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.
Wonder what's likely to get the chop? We've noticed HTC removing some pre-loaded apps from its 2011 phones anyway, dumping previously core HTC Sense features and making them optional downloadable extras through HTC Hub – so it shouldn't be much of an deal-breaker. You just might have to choose between having a clock or a Twitter client.
source: Eurodroid