The Arcus 501 is based on a 5″ (800×480) LCD screen and it’s running on a Rockchip 2729 CPU. It has 4GB Flash storage, microSD card slot, speaker, microphone, FM Radio, but no Wifi or touchscreen. It promises broad audio, video, and ebook support. Retail is 2990 rubles (~$106 USD), and it’s available now.
I recognize this device. Both the Rockchip CPU plus the button layout makes me think that this is a later incarnation of the Delstar Openbook. This hardware has shown up under a bunch of different brands, so I’m not surprised to see it again.