From Google Translate:
Episode 1 will be about the Solar Flare that unleashes the Kaijus and X makes his debut. Episodes 2-3 will be about Birdon (why they keep making Birdon coming early in the series). Episode 4 will have Telesdon (and the night battle).
I LOVE everything I've seen so far in the previes. The mechas are reminiscence of Super Guts' with the color scheme and all. And those vehicles, and especially the truck xD
But most importantly, X's armaments. I love that Eleking armor.
Small correction: Birdon is only in episode 2 and Telesdon is in episode 3.