I received a tip last minute (I can not reveal the source): We'll have ODROID-C1+ next week. This is what I know about the changes that it have with respect to the first version...
Change the HDMI connector to Type-A from Type-D.
Improved SD card compatibility
CEC function without RTC backup battery
Power path from USB OTG port as well as DC-Jack
Expose I2S signals for external audio DAC
Price: $37 (34 Euros)
Actually I consider the ODROID-C1 has a great value for money. Soon I will have the ODROID-XU4 in my hands, so I'll do the corresponding unboxing and will take several benchmarks.