This blogger is very dedicated or really needs to get a day job -- he types up and posts transcripts of the conferences, usually within 24 hours:

http://weblogs.mozillazine.org/asa/

You can also see archived video at www.cspan.com

As for the sulfur, we had a tiny bit more data today. Before Sqyures had said something about there being a lot of sulfur. Today he was a little more emphatic, calling it an ENORMOUS amount of sulfur (his all caps, not mine, given his tone of voice...). But, didn't say a word about other elements, and I can't believe none of the journalists asked. Very frustrating.

They really seem to be pushing the salt crust idea at both locations. My understanding was that there are plausible mechanisms to do that using just tiny amounts of moisture from the air over time, doesn't imply near-surface water table.