AFAIK
OFT is actually a Alientech powergate 3 device (hardware)
http://www.powergate-alientech.com/en/
The OFT is a customised version.
The OFT guys have added the logging/tune alerts/driving monitoring etc either themselves
The standard powergate devices just flash tunes no logging or other fancy features.
So some updates for tablet come directly from alientech likely pushed out to all alientech powergate 3 devices.
Other updates are specific to OFT, these may be uploaded to alientech servers by oft guys not sure
Apparently the Template file is now auto updating and no manual update needed anymore
You need to use the specific Openflash manager for your vehicle type is BRZ/86, if you load up say the mazda version your oft will convert to a mazda oft :-)
Tunebot is likely some feature not used no info on it on alientech site either, if you keen email the alientech guys.
I am unaware of any alientech or oft changelog for the device updates.