As it was predicted before, iriver has just released the all new B30. As you can tell by the name already, it is the successor to the B20, meaning that this device is all about DMB. The B30 has an accelerometer for a cover flow feature, and apparently comes packed with a pair of SRS CS headphones. The device supports UCI and comes with a unique UI which I personally think is rather ugly (which is rare for iriver). There aren't too many features, but keep in mind that the B series is mainly for DMB performance.
There are some details that are quite bizarre about this device. First of all, iriver will only be selling 500 units, which clearly shows that they didn't intend on investing too much time/money into this device. It may show why the UI and design aren't up to par with other iriver devices. iriver actually didn't even make a product page for the B30. Nevertheless, the B30 goes for $155 (4GB) and $183 (8GB). BTW, the spec sheet shows a 16GB model, which isn't showing up in iriver's store for some reason.

EDIT: It wasn't worded by iriver very well but it may be that the "500" refers to the number of units that they'll be selling in this first wave of preorders.

TECH SPEC
Capacity: 4/8/16GB (w/ microSD)
Color: white/black/silver
Size: 109.5 x 56.9 x 11.15mm (84.7g)
Battery life: 40hr (music) / 6hr (video) / 5.5hr (dmb)
Display: 2.8" QVGA
Music: MP3/WMA/OGG/ASF/FLAC/APE
Video: AVI/WMV/MP4

iriver store