I don't think 'New' is the right word. It's been a target for the last few years.
The problem is people DON'T update WordPress and their plugins, and they're not using secure ones. Like, last week there was a guy who bought a 'nulled' theme (you know the kind you get NOT from the developer, but some back alley?) and was shocked to find out he'd been hacked from it.
And to that and, I say again, the issue is not WordPress itself, it's what you add on to it.
I get WP hack attempts on things like timthumb all the time too. I don't use it. It's not in my themes or plugins. But still, people know that folks aren't using the latest versions and they target it.
All the security plugins in the world won't help you if you're not careful with what you install on your website.