This is probably the beginning of the end of b/g devices from Ubiquiti (including the Nanostation and NanoLoco) in favor of their "M" series.
They have a TON of development going into the AirOS V and all the fancy things you can do via AirControl.
For outdoor/rooftop/tower LOS applications, the M gear blows the doors of their previous products.
I'm pretty sure they stopped manufacturing most of these older devices already. Those who have purchased them are likely buying from old stock - now UBNT is going to discontinue support.