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Some death when lyphilized in phosphate buffer, but not much.
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=243925
And here's another type of spore that survives just fine when lyophilized in an appropriate medium:
http://www.springerlink.com/content/x314k436v7240362/
Although there is no evidence of material such as bentonite or silica from Meselson's reports, it's not clear to me he would have seen something like glycerol or or one of the polymeric wettting agents if it had been present to preserve viability during the freezing cycle.