I recently opened a new eBay account. eBay didn't know that I had had an account for years and, as seems to have happened with you, the first time I tried to list an item I was presented with a very basic (streamlined?) page. I also thought it must be a new, updated form, but then I noticed a line which offered me the choice of switching to an advanced page. I did that and the more detailed form appeared. I cannot remember off hand where that option appeared, but it is somewhere on the basic form you are seeing.