... But that's not necessarily when you'll get them
HTC has taken to its official Facebook page to answer fans' questions about Android 4.0 Ice Cream Sandwich updates for previously announced devices, such as the Desire S and Thunderbolt. In a statement repeated across several posts, HTC said --
"We're still working on getting the updates ready. We expect to have updates issues [sic] by the end of August for all devices that have been announced."
It's also worth remembering that even if HTC's finished with its updates before the end of August, that doesn't mean that's when they'll start rolling out to handsets. Mobile carriers still need to test and sign off these updates, a process which in the past has taken months to complete.
So it's a promising development, just don't expect a torrent of updates to drop in the next couple of weeks.