The tag should be "please rename". It's a verb so it can be easily caught as a meta-tag. The text in the page (first line) should be something like
This page will be renamed into "target name"
This page will be renamed into "target name", this page will be kept as a redirect
if a redirect is needed (because linked from the forum or external in a mailing list)
The above tag+todo-message set is only an example. An English native speaker will surely meet the good tone better than I.
Topic changed. Former Topic was "[Suggestion] Mark pages to be renamed with standardized tag+todo-message"