Supposedly there will be no carpeting on the exhibit floor this year.
I have seen this discussion pop up from time to time but did not think much, but seems like this is something folks should prepare. I saw this being stated at the Parks and Cons annual Exhibit Floor video ( or skip to minute 17:56).
I also know folks who went to CCSE said no carpet was laid out either. Seems like another cost cutting move by Comic Con this year.
As always, things could change and wait for official word and all that, but I would probably prepare your feet and shoes for no carpeting for the whole 4+ days.