... GPLv3, or any later version with a similar spirit published by the Free Software Foundation or its successor.
Remember that without a license most people don't have any right to copy the software at all, so it's in a corporation's best interest to make sure the GPL continues to be valid. And the law always does what's in a corporation's best interest.
What is the spirit - is gpl 2 and 3 the same spirit? Some will argue no.
Right now gpl assumes things fall back to copyright but companies have an interest inencoding open soure into law in a way that would benefit them. Some trickery could make something in gpl illegal and then by law it falls back to the new open source license not no license.
Remember that without a license most people don't have any right to copy the software at all, so it's in a corporation's best interest to make sure the GPL continues to be valid. And the law always does what's in a corporation's best interest.