No specific info about version 2.5 beta. Please visit the main page of ImgBurn on Software Informer.
I've been using it for over 3 years, and it has exceeded my expectations! I've just needed to update it once.
The latest version is bundled with the OpenCandy adware that you can't opt out when installing.
This version is safe SetupImgBurn_184.108.40.206.exe.
The Best thing available in a Small Package!!!