Dual DAC system similar to the AK240 (Maybe release a limited X7s with this feature)
Wi-Fi and Bluetooth.
Open source or release a dev kit for developers in the hifi comunity to make applications. Closing the system will make it safer but progress will be slower.
Built in storage options: 32GB, 64GB, 128GB (Maybe even add extra features to higher memory versions. Dual DAC and faster Processor to name a few)
Faster transfer rate. Currently the chip set on the X5 only transfer at about 5-10MB.
2 Micro SD slots