According to AmiAmi online shop, the sixth volume of the Blu-ray and the DVD of Hourou Musuko will include the episode 12, which will not be aired on TV. It will be released on September 21st.
According to MyCom Journal, the seventh volume of the DVD of Sengoku Basara Two will include an extra episode 13 "Ryuko, Itadaki no Chikai! Atsuki Mirai e Kakeru Tamashii!!". It will be released on April 6th.
DenjaX said: Whut?!? Does that mean we won't see the ending of Hourou Musuko and wait until September?!? dsafsaflsadjlkjslkjsdafdgdsfhsdg
Maybe ep 12 is just an OVA and ep 11 is the ending.. I hope it's that way xDD
Episode 11 and will be an open ending and so will episode 12.
The manga is still ongoing, and it would be silly to attempt an anime-original ending on a human drama series that doesn't really need immediate closure like Hourou Musuko.
In fact I would say that the only true closure for such a series is the death of the main characters, and that it is never truly finished until that happens, for you can continue a story which is essentially about the lives of people for as long as the main characters live.