PLease, dear native English speakers, help me to understand the meaning of the expression "a year on" within the context "The reality is that, a year on, a true 4K standard is still very much a work in progress..." Thank you a lot!
It is an idiom that simply means one year later.
In the sentence you give, it is not clear what is the start of the year's duration. However, time has run on one year - hence one year on.
A year + on
According to Merriam Webster, as an adverb, "on" also means a more advanced point in space or time; later on.
According to Longman, it means after a particular time such as Now, a year on, he is one of the most successful businessmen.
So the sentence implies "The reality is that after a year, a true 4K standard is still very much a work in progress".