Now they're back with a musical album, and a denpa themed one at that! Although they have offered very few details about the upcoming 「sweeCHU kiss」 mini-album, they have repeatedly stated on their blog that this will be denpa-kei. The imagery sort of gives it away, but this circle introduction video has a very short sample (we're talking less than 20 seconds). Either way, we here at 電波の世界 fully support new denpa units so let's give them the benefit of the doubt until they release longer samples.
UPDATE: They have released a sample MP3. Furthermore, ベイビー・レモネード from melo9/おでんぱ☆スタジオ will be a guest artist!