FTTC

[#1]

Are PlusNet able to find out when a cabinet that is included in roll out plans will actually be upgraded?

[#2]

Nope
The only information is what you can get from https://www.btwholesale.com/includes/adsl/adsl.htm

[#3]

Unfortunately not.
As Jim says, we can only really go on what the dslchecker says.
My apologies.
Matty