Update: Here is the announcement (link).
The new Yotaphone is said to have larger screens and a more polished design. Yota Devices isn't sharing any other info, but they did confirm that a new device will be announced next week. They will have it in their booth for everyone to see.
The current Yotaphone is an odd looking beast with 2 screens: an E-ink screen on the back and an LCD screen on the front. The screens measure 4.3" diagonally, and have resolutions of 720 x 1280 (LCD) and (E-ink) 360 x 640. It runs Android 4.2.2 Jelly Bean, non a 1.7 GHz dual-core Qualcomm SparDragon CPU with 2GB RAM and 32GB Flash storage.
The phone has been under development since 2010 and was first unveiled in late 2012. Thanks to the dev costs and the extra screen it's a rather pricy device. It retails in Europe for 500 euros. That's a rather high price for a new device from a relatively unknown company, but it has found a market. Kommersant reports that 12 thousand Yotaphones have been sold since it shipped in early December 2013.
And now, just over 2 months after the first model shipped, Yota Devices is ready to announce a new model.