There are currently 3 ranges to Spitfire Audio's Abbey Road products.
What are the differences?
Abbey Road ONE:
This range is made up of one core library called "Orchestral Foundations" and multiple other little libraries called "Film Scoring Selections". These are all installed into one stand alone plugin.
This range is designed for quick orchestral writing using ensemble patches, and pre orchestrated techniques.
Abbey Road Two - Iconic Strings:
This range is a solo strings library only, aimed at the vintage sound of the iconic studio 2 of Abbey Road.
It is a drier acoustic space and more suited to pop / vintage solo string writing.
The Abbey Road Orchestra:
This range will become Spitfire's most detailed orchestra and should not be confused with Abbey Road ONE.
Though recorded in the same studio as Abbey Road ONE, it will feature a lot more extensive content. For example individual sections for the strings, low and high percussion.
This range will be most suited to pro end users that wish to have high levels of detail in their orchestrations.