I'm an Admission Tutor at a Cambridge College (and a Social Anthropologist) so am happy to help with any concerns prospective applicants have about this 'New' HSPS Tripos... Nothing has been 'cut' from the courses on offer - HSPS is just the new title that covers the more exciting way to study a combination of what is already on offer in 'Arch & Anth' and 'PPS'/International Relations. For a basic overview of what the course actually entails and the exciting range of options that can be studied, do look closely at the websites of St John's, Kings and Trinity that previous posts have mentioned. There is also very useful information on many other College websites.
Meantime - if you are a keen student of politics and power, history, society, culture, people... the kind of person interested in those big questions about what it is to be human, culture and communication, the significance of relationships between past-present, nature-culture, or the world we live in and the one we are (re)creating... rest assured, Cambridge has even more on offer than it did last year... Of course I'm, obviously biased, but do check out what HSPS is before you go further with your UCAS choices... find out more - and apply if you find it interesting!