http://ja.wikipedia.org/wiki/末永真己
According to that Suenaga Mami released a mini album in September.
But I'm not sure because my Japanese isn't the greatest because I'm only doing grade 12 Japanese at school.
And I'm only ment to know 180 kanji.
Here's her blog.
http://blog.livedoor.jp/jamcrea/
On the side it looks like a cover for her mini album.
I think its released under the project-rin label or that project-rin is a group?
I'm not sure.
Here's the site
http://www.project-rin.com/
From the looks of it Saki is now a model ?
http://www.kyotei.or.../magazine/saki/
Suenaga now goes by the name "Rin", and has released a mini-album just weeks ago! She's a solo singer, but she has a steady band. The members are listed on her page.
Arai Saki went back to using her name the way it was originally written (In H!P, the "Saki" part was written "紗紀"-her real name was written "沙紀"--just a change in radical. Still pronounced SAKI) and became a model, but alas just like Oki Ibuki (who works under the name EVEKI), they haven't gone too far with that.
Kitagami Ami is using her real name (Ryouke Ayumi) and is a SOLO TARENTO which (just like Ishiguro Aya, Ichii Sayaka, etc.) means they appear on talk shows or panel/game shows and stuff by invitation. Nothing major.