This is an interesting topic and of course it very much depends. However, as you approach your interview preparation, you do kind of need to know what to research and what not to.
There is no hard and fast rule to this because in truth it will depend very much on the propensity of those interviewing to keep up-to-date themselves. That in its own right might depend on how much a new issue is likely to affect them and even then, this assumes that they realise how it might affect them. Let’s look at an example…
We are now a few months in to Simon Steven’s 5 Year Forward View, published in October 2014. It contained a wealth of information about how models of care and particularly, models of local hospital structure, may change over time. However, here we are in February 2015 and as I continue to train teams and individuals in the NHS, how it is changing and leadership, the default is that very few people have heard of it and even fewer have read it. And yet, it will impact their lives greatly over coming years.
More information: Five Year Forward View
What we tend to see, is that issues with a more immediately time horizon tend to be asked about much earlier than issues with a much longer time horizon, irrespective of the magnitude of effects. So, something that is causing an immediate small impact can often be more pertinent at interview than something NEW that has much greater implications. To be absolutely clear, issues of great importance definitely creep into interview questions and must be researched. It’s just far less easy to predict when.