Series is now schedule by all Japanese official sites as 27 episodes... however, that's just because they're counting next week's recap as an episode.
Anyway, 22th we get the time-skip and both a new opening and ending obviously. Nevertheless, Viral is now the episode title guy. Here are the future episode summaries and titles:
Episode 16(Now 17... whatever): Old marriage, going to the moon stuff we knew from a while ago.
Episode 17(Now named episode 18.. whatever): "I want to hear it now, the truth of this world."
The ominous Helix King's last words are slowly becoming reality as predicted when a unidentified creature suddenly appears beyond the moon just the moment human population reached a state and number fit for evolution. Unexpectedly, a mysterious third party appears from nowhere and a recognizable figure declares war on the Human Defense Organization.
Episode 18(Now 19... whatever): "I will do it, no matter what it takes!"
Rossiu's newly found dilemma leads him to declare Simon guilty of treason and quickly arrests him on this charges. Chaos quickly grows among the populace rioting populace and uncertainty grows as people become reminiscent of their old days underground. The former members of Dai-Gurren confront Rossiu about Simon only to be met by a dramatic revelation. Meanwhile, the mysterious creature keeping its eye on Earth grows nearer by date.
19(Now 20... you know the deal): "So this is how the last dawn of humanity looks like."
The Humanity Defense Organization breaks into pieces as wars break among Earth's population. Humanity major enemy turns out to be humanity as human piloted gunmen start destroying human piloted gunmen without discrimination. Simon's makes up his mind as an enormous creature sized as the moon covers the sun appearing right above the chaotic surface.