The German PHP publication PHP Magazin has taken a bold step to show their support of things like the Go-PHP5 Project with their latest announcement:

With the beginning of issue 1.08 (coming to the newsstands in November 2007), PHP Magazin won't accept any articles or source codes that cover PHP4 topics or PHP4 sourcecode. Sourcecode delivery must cover PHP 5.2 or greater.

You can find out more information about submitting to this German publication on their website (including several topic suggestions to help get you started).