HTC ThunderBolt and HTC Desire S to be updated to Android 4.0 by the end of this month
Even if HTC is finished with all of the Android 4.0 updates by the end of the month, that doesn't mean that they will all be sent out precisely on the last day of August. There still is the matter of getting the carriers to sign off on the update for each specific model and in some situations, this has taken as long as months to get done.
Earlier this year, back in the merry, merry month of May, HTC had said it would have all of its eligible phones running Ice Cream Sandwich by the end of August. It was very close, but at this point it looks likeHTC will miss with that prediction.