Mawaru Penguindrum Thread (Spoilers)

There's a lot of speculation about the ending.

Basically in the end:

 Spoiler

world line transfer. They are now in an alternate world line, but both Himari and Ringo have things they remember from the previous one. Ringo has a burn on her wrist, Himari has the cut and crying when she read her brother's message.

Also this picture pretty much describes how fate worked in the series:

 Spoiler

Lots of symbols and stuff everywhere.