Udon Entertainment kindly replied to me on Twitter and confirmed that the second and final volume of Sengoku Basara: Samurai Legends has been delayed again due to holiday printing schedules, but it's due to come out towards the end of January in comic shops with larger bookstores getting their stock in February. It's a shame it keeps getting pushed back - kudos to the Udon team for being so responsive as always, though. I can't wait to be able to buy it soon.
In completely unrelated news, the Sengoku Basara team at Capcom have provided a wonderful festive image for mobile users. You can view it here and it's only slightly creepy.