From what I understand, it means that rex will no longer only take pulmuno egg kibble, but also carno, stego, sarco, terror bird, and so on.
Stop complaining about dinoes being useless after this, they were already useless before if the only use was to make eggs.
ALSO:
This is a huge change to solo players. Will make the game much faster, as you no longer need a billon types of kibble.