It’s not the complete redesign that was planned and canceled, but two new themes have been added to Ubuntu 8.04. The new GTK themes are Human-Murrine and Human-Clearlooks. The Human icon and Metacity themes are unchanged. Currently, Human-Murrine is the default in up-to-date Ubuntu 8.04.
The most distinctive feature of Human-Murrine is shaded application menu bars. Buttons are square and highly glossy. Here’s a screenshot: