I'm not exactly sure how valid the information is but since it comes from HTC Turkey's Facebook page, it seems to be legit. And even if some of the dates seem to be outdated - for instance has the HTC Desire S already received its Android 2.3.5/Gingerbread and HTC Sense 3.0 upgrade - other scheduled and upcoming upgrades are new. The good news first: The Desire HD, Desire S and Incredible S are all confirmed for Android 2.3.5 and HTC Sense 3.0 upgrades as well as the Wildfire S which will also receive Android 2.3.5 but HTC Sense 2.1 only. The ChaCha and Salsa will only receive maintenance updates to improve WiFi and Twitter functionalities while the long awaited Flyer upgrade to Android 3.2/Honeycomb is also confirmed for December.
- HTC Incredible S: Android 2.3.5 with HTC Sense 3.0: December 10th
- HTC Wildfire S: Android 2.3.5 with HTC 2.1 and new lock-screen: December 10th
- HTC Desire HD: Android 2.3.5 with HTC Sense 3.0: December 15th
- HTC Desire S: Android 2.3.5 with HTC Sense 3.0: December 15th
- HTC Flyer: Android 3.2 Honeycomb: December
- HTC ChaCha and HTC Salsa: update to improve WiFi and Twitter functionalities: December
Again, as far as I know some of the devices have already received the above described updates and upgrades while others - there I'm sure - haven't received them yet (like the HTC Wildfire S and HTC Flyer which I use both). Unfortunately not on the list is the HTC Desire Z.
UPDATE: As of today, December 5th, HTC has started to roll-out the Android 3.2/Honeycomb upgrade for its GSM HTC Flyer (see notification photo of the available upgrade here). The upgrade is around 211 MB and distributed, as always, as an FOTA (Firmware Over The Air) update. On its UK Facebook page, HTC has also noted, that "the WiFi version of the HTC Flyer will receive its Honeycomb update soon, too". Honeycomb brings "a ton of improvements to Android on tablets, including the latest version of HTC Sense for Tablet with enhanced Internet browsing, Mail, Calendar and more all optimized for the 7" screen" which is the reason why it took a little bit longer. Because only Android 3.2 added support for tablets smaller 10" screen size.
UPDATE 2: As of today, December 7th and a little bit earlier than expected, HTC has started to roll-out the Android 2.3.5 update for the HTC Wildfire S.
Cheers ~ Arne