Finally here is Mageia 3 beta 1. This first beta release was a bit tricky as it comes with some major new features in installer. GRUB2 has been included as an option for now.
Using DVDs with classical installer you will be proposed to install some proprietary drivers and/or firmwares. Just choose to add nonfree media.
More info:
https://wiki.mageia.org/en/Mageia_3_beta1
https://wiki.mageia.org/en/Mageia_3_Errata