According to HTC’s Facebook page, the Thunderbolt is still on schedule to receive its Ice Cream Sandwich update by the end of August (this month). They told us back in May that we should expect it in either July or August and are sticking to their guns.
Other than the Thunderbolt, the Rhyme should see it as well, unless something has changed since we last heard from HTC. The Incredible 2 is apparently still questionable.