Siliconera just posted their interview with Kenichiro Takaki (producer of the series), with the whole thing being available there.
Here's a few excerpts:
About the 1st male playable character, in Senran Kagura 2:
Fan service (he's asked whether he's ever had to go back and change stuff after crossing the line):
Finally, Jimmy Soga from XSEED chimed in about Senran Kagura Burst sales, and what people have to do for Senran Kagura 2 to come westward:
Here's a few excerpts:
About the 1st male playable character, in Senran Kagura 2:
I wanted to try a male character at least once, that’s why Murasame is in the game. He’s treated the same as the female characters, he has sexy poses too. [Laughs and makes sexy face]
(....)
[Laughs] I looked at a lot of magazines that show the male form for reference. Yeah, we did our research. [Laughs]
Fan service (he's asked whether he's ever had to go back and change stuff after crossing the line):
I keep in the R18+ or Japanese version of the R rating in mind. In Senran Kagura: Bon Appétit there are scenes where you see the girls get covered in food. Originally, they didn’t have chocolate sauce drizzled on them. I added chocolate sauce because I thought the girls showed too much skin and it turned out adding that in was even more erotic.
Finally, Jimmy Soga from XSEED chimed in about Senran Kagura Burst sales, and what people have to do for Senran Kagura 2 to come westward:
JS: We’re taking it case by case. Senran Kagura Burst did really well. It was download only, but there’s enough to say there is a US audience for it that’s why we went with Shinovi Versus. It’s sort of risky, but we localized Bon Appétit at the same time. We think there is a core audience for it, but it’s case by case for now. If these sell well enough of course we want to continue with the series.