I know that tickets were dropped for the first night at Staples. I already had floor tickets for both nights, but had friends trying to get in the first night. One got in with a released floor ticket. He told me that only 6 floor tickets were released, at least to the point when he got in. Staples staff was walking the line letting people know they had $171 tickets available, but most people were not interested in these when I was outside around 7pm.
For night 2, as of 7pm, supposedly no tickets at all had been released.
You may have a shot at floor in Vegas, but I think the floor size may be a little smaller at the MGM, as it was not built to accomodate basketball and hockey, thus there may be less floor tickets that were sold for these shows.