Got mine today. Only had a quick glance through it, but the main standouts from that...
A little more structure has been added to the information phase with a Take, Use and Give getting more prominence with a little TUG diagram.
Fixed input steering is presented as "the standard hold" and emphasized as being the default (as opposed to being an alternative to pull push) for small changes of direction, with pull push recommended for larger changes.
A revamped section on speed selection, and a discussion on how drivers can come to underestimate speeds.
Overall no significant changes in practice (as you would expect), just perhaps emphasizing some areas that observers/tutors will have been doing with their associates anyway.
(I don't have my old copy to hand to directly compare, so it is possible I am slightly misrepresenting the differences, at my age things like memory become tenuous
)