This first part is nothing more than a rumour. Popular veteran seiyuu Furukawa Toshio was spotted tweeting about how much he enjoyed going to see the Butai Sengoku Basara 3 Utage stage play a few days ago. While I stress that there are absolutely no signs he was attending the event as anything more than a fan, some people have been suggesting that his interest in the series might be because he has a role in the upcoming new game. Whether it's true or not, I was very pleased to see that such a big seiyuu likes the series.
The second rumour has a more solid basis since it's being reported on game websites as part of their coverage of the play. I mentioned before that the first ever Sengoku Basara Busho Matsuri event will be held on the 13th July 2013. This festival is predominantly a celebration of the various Butai Sengoku Basara stage plays, but now KobaP has said that it will also feature the debut of new Sengoku Basara 4 footage along with some additional information about the new game. I have mixed feelings about this; it's certainly a good way to draw more fans to the event, yet I'm a little jealous of the hardcore stage play fans since I can't go myself. It's also true that some people only like the stage play, not the games themselves (and vice versa). Hopefully the new material will be good enough to please everyone.
Let's just hope that all of the new material will be posted to the official website the week after the event as usual!