The beyond package is dropping vesafb-tng in favour of the stabler vesafb.
To use vesafb, pass vga=mode to the kernel, where mode is from the table on the wiki linked below.
For example,vga=792 corresponds to 1024x768-24.
http://wiki.archlinux.org/index.php/Gensplash#Table_of_vga.3D_values