Posting in the Magento forums has been disabled pending the implementation of a new and improved forum solution which should better serve the community.
For new questions please post at magento.stackexchange.com, the community-run support site for the Magento community. We will be providing updates on the new forum solution soon. For questions or concerns please email firstname.lastname@example.org.
Actually there were no requirements changes since the previous Magento version. You can use the same php5-cgi workaround as before. Check out the Installing Magento on a PHP4 server Knowledge Base article for details.