+1 for visible IDs. For one, the Template Tag, wp_list_pages() uses only IDs as a means of including / excluding those pages to list. And it’s a powerful and helpful tag.
But hey, this _is_ an RC and not a final release, so all’s forgiven and lovely (but pretty please to getting the ID’s visible again before 2.5) — thanks one and all.
PS: Hover over does not work for me either. However, if you view the source of the Manage, Pages page, each pages row has several references to its ID. Or, if you click the Pages’ name, you go to the editor and it’s URL ends in ‘post=No.’ where No. is the ID of the page.
PPS: An easier way is to indeed hover over a Page Title in Manage, Pages and as long as your browser has a status bar (usually at the bottom) where it shows the URL of any hovered-over link, then that too will end in ‘post=No.’.