Here are the main points:
Totally exam-based. There is no practical exam, although you have to do certain practicals in school.
Four basic courses, Biology, Chemistry, Physics and combined (double) science. So no core, additional and further additional.
All courses are linear – that is you take the exam once, at the end of the course. That means that the first exam will be in the summer of 2018.
The four courses, along with their codes, are:
Combined science (1SC0); Biology (1BI0); Chemistry (1CH0); Physics (1PH0)
Details of these courses are on the Edexcel Science GCSE webpage.