Wow. That is unfortunate to hear for this actor. There was a certain fondness that I've had for his voice from various movies trailers, and he will certainly be missed by many. An interesting thing, too, is that there was a discussion in my Introduction to Computers class on the first day of school (August 25th), about him in part of the 1960's movie trailer announcer after viewing the one for How the West Was Won.
I wonder what he died from? At least he had a decently long life at the age of 68. I, too, am curious of who will be the next voiceover, but I have a feeling that it will be the man who speaks for the TNT channel (the voice for Cat in the Nickelodeon show CatDog, I believe, but I do not know of his name).