A very interesting picture cam across Ami's Instagram account yesterday. To sum up, it looks like she is in studio and holding a microphone. I tried not getting too excited, but the potential of Ami and Yumi doing album work would be welcome news.
From the rough translation though... it is more likely this is a rehearsal for the Billboard Live show.
Sorry for the tease, but team Puffy is not giving me a ton to work with.