You may notice there is no longer a quote button on the last post in a thread, really not that needed in most cases anyway and just ends up clogging a lot of threads up with extra uneeded quotes. If you want to quote the last post in a thread you can still do it through the preview pane which I've actually been doing myself quite a bit lately, easier, faster and more precise for specific text:
Using the Quote Botton, Special Tip