Just to clear up what's happening when, unless anything changes:
From September 2014 the new national curriculum applies for all subjects except English, Maths and Science*.
From September 2015 the new GCSE syllabus will be taught (to current Y8s) in English and Maths only, and will be first examined in June 2017.
From September 2016 the new GCSE syllabus will be taught (to current Y7s) in the remaining subjects which will be first examined in June 2018.
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The National Curriculum for KS4 English, Maths and Science (i.e. GCSE level) is not changing in September 2014 because it is not ready.
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Pupils in Y2 and in Y6 in Summer 2015 (so current Y1s and Y5s) will take KS1 and KS2 tests respectively in English, Maths and Science according to the current (pre-September 2014) National Curriculum.
So in summary, if you are currently in:
YR - everything will change from September 2014.
Y1 - everything will change from September 2014 except Maths, English and Science which will change from September 2015.
Y2 - everything will change from September 2014.
Y3 - everything will change from September 2014.
Y4 - everything will change from September 2014.
Y5 - everything will change from September 2014 except Maths, English and Science which will change from September 2015.
Y6 - everything will change from September 2014.
Y7 - the National Curriculum will change from September 2014, Maths and English GCSEs change from September 2015 and the remaining GCSEs from September 2016.
Y8 - the National Curriculum will change from September 2014, but GCSEs will stay the same, except for Maths and English which will change from September 2015.
Y9 - the National Curriculum will change from September 2014 (except for English, Maths and Science), but there will be no changes to GCSEs.
Y10 - the National Curriculum will change from September 2014 (except for English, Maths and Science), but there will be no changes to GCSEs.
This ignores any changes to A levels, these have not yet been scheduled. It's the current Y8s that are potentially the big sufferers in this: as it stands they may end up with a mix of GCSEs graded E-A* and 1-9, or even (if OCR get their way) with marks instead of grades.
So that's really simple for children, teachers, parents and employers to follow isn't it?