I have pupils already working towards ALL the grades in the new syllabus with the exception of Grade 4, which I have never used before and am still no more convinced by (it remains my view that most students working for 4 can actually jump to 5 if they wait one more term).
SO... general thoughts:
Scales/technical requirements: considering the bold fanfare, the changes are slight indeed, so much so that it rather appears more like a marketing exercise, and perhaps an attempt to boost sales for the ABRSM scale books. Most of the changes are in my view either pointless tinkering (reinstating root position arpeggios at Grade 7) or in some cases, misguided (removing arpeggios at grade 1).
The one change I do like is the replacement of B minor with G minor at Grade 2, which I think is a sensible move.
Sight ReadingA fantastic improvement all round. Thank you ABRSM
Repertoire: ArrangementsI like the principal of including arrangement, but am not enamoured with many of the specific arrangements included.
Top Cat is great as others have said. Personally I quite like the
Vivaldi too, perhaps in part because I'm not very fond of the two alternatives in the book. I like
L'Elephant as well.
Mazurka from Coppelia is a horrid choice - the original is an annoying thrash-athon anyway, and on the piano it just sounds dreadful. And Wonderful Tonight is unsuitable at Grade 2, where consideration really should be given to younger players with small hands when selecting pieces that mum and dad will want their child to learn. Bad choice.
More specifics by grade:
Grade 1:
Early One Morning is far too difficult, and so ironic that it largely consists of the arpeggios removed from the syllabus.
A Song of Erin is lovely though, and really encourages expressive phrasing and playing.
Never Vex a T Rex doesn't nearly live up to its title in my view - not exciting musically. I note that others here like it, but I prefer both alternatives.
Grade 2: Like A2, but thought A3 rather odd. Definitely like the
First Snowdrop a lot, and it's popular with students.
Mozzie is good from List C.
Grade 3: A1, B2, B3, C1 and C2 have all proved popular with my students at this level.
Grade 5: all my pupils at this level (about half a dozen) like the
Haydn from list A best. Grieg's
Norwegian Air is also popular. I like the
Schumann piece too, but a lot of players seem to find the three-part figuration hard. I teach it as good practice, but suspect the Grieg will be used more in the exam room.
In the Groove is great - possibly a little on the easy side though?
Grade 6: I'm not hugely impressed with this selection. From List A I have a student working on the
Clementi from the alternative pieces, which is a nice piece to play and fits well under the fingers. The
Satie on List C is also an obvious choice, although some will enjoy the
Oscar Peterson, and its good to see more serious jazz creeping in more.
Grade 7: Again not particularly inspiring, but the Haydn (A2) is a grower, and I have a couple of students enjoying that piece at present. The Chopin Mazurka from the List B alternatives is a very good choice. List C is great all through - the three pieces in the repertoire book are all winners, as is the alternative
Janacek piece - well worth exploring.
Gread 8: There's so much choice at Grade 8 that it would be hard not to find something good. As often happens though I am again reaching for the Alternative pieces. List A: the Bach Partita (A5) and on List B the Mozart selections (B7 & 8) are appealing. I clearly remember playing Liszt's Db Consolation for GRADE 7 back in the day... interesting to see it now on a Grade 8 list. A truly beautiful piece which anyone at this level should play anyway, so great to have it as a Grade 8 option

Just my thoughts, and I'll probably change my mind as the two years develop - I usually do!