Shimano XTR SC-M9051 System Information Display for 11s Di2
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If you're thinking of using this display on your road bike to replace your Junction A (SM-EW90 / EW-RS910) and Wireless Unit - you can! Be aware that you can only have one component with wireless/bluetooth functionality connected. If you connect both this and a Wireless Unit the Di2 system won't function.
Functionality wise this unit is identical to its cheaper XT sibling, the SC-MT800. The casing is not, but that is the only difference.
2nd generation battery or mount required
Just like the SC-MT800 display, this SC-M9051 requires a modern battery (BT-DN110) or battery mount (BM-DN100). The display will not work with the older batteries.
Synchronized shifting on mountain bikes
If you want to use synchronized shifting on your mountain bike the usual requirements apply - you need either a BT-DN110 battery or BM-DN100 battery mount.
You will also need a System Information Display. It is not clear why exactly you need one, but I've asked Shimano and they have confirmed that a display is required for synchro shift on mountain bikes.