Did Haruka Tomatsu actually say so at the "Masters of the idol world" concert?
If it's true it means there won't be new games with the DS characters and they won't get new songs!
It will be... the end...! 
As far as I know, the project disbandment thing might be true. They shipped the director of DS off to take charge of the Weiss Schwarz iM@S series after sales weren't that great. I don't know about the part about Tomatsu speaking though, as I don't speak Japanese. Here's the video if you want to watch it. Below is all of Haruka Tomatsu's appearances during the concert and within the backstage video, if I remember correctly.
Day 02 of the Concerthttp://www.bilibili.com/video/av1833139/index_3.html32:50 - "HELLO!!" (M@STER VERSION)
48:50 - Sora Appearance
49:40 - Haruka Tomatsu and the Reds Talk
http://www.bilibili.com/video/av1833139/index_5.html35:20 - M@STERPIECE (M@STER VERSION)
38:50 - Haruka Tomatsu comes out at M@STERPIECE
41:15 - Eriko Nakamura talk
42:00 - IDOL POWER RAINBOW
46:40 - Thanks by everyone
47:50 - Million Live exit
48:15 - Cinderella Girls exit
48:50 - Dearly Stars Special exit
49:20 - 765PRO ALLSTARS exit
CREDITS Haruka Tomatsu Appearances
56:25 - "HELLO!!"
56:35 - Reds
56:37 - M@STERPIECE
57:25 - Thanks by everyone
Behind the Scenes Videohttp://www.bilibili.com/video/av1668545/8:30 - Day 02 Cheer with everyone
18:22 - Haruka Tomatsu Interview
20:15 - Haruka Tomatsu End Tunnel and Thanks