Just reading specifications of Neo900... Optimistically.
1GHz CPU, 1GB RAM, 64GB EMMC,
proximity, compass, gyroscope, barometer/thermometer (Having both would be excellent. If only one, then I prefer barometer; bme already includes temperature sensor from battery, touchscreen might also be used as temperature sensor, and human can approximately feel temperature. Figuring out the pressure is a bit more difficult)
Infrared (curious)
Micro-AB with OTG
Stereo, both in and out, and speakers
Video out
FM transceiver
RS232 (It is an ancient piece of hardware, much like a ball mouse
RFID-EEPROM (Like N9?)
GPS/GLONASS (great! Now, how to add other kinds of positioning systems... I heard Europe, China, India and Japan are starting their own satellite networks?)
Battery hot-swap support (Thank you!)
WiFi 802.11b/g, Bluetooth 2.0
Best wishes...
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Per aspera ad astra...