Of course there will be, though it'll be a while before you get over the hump and reach over 50 and over. Google regularly updates their algorithms.
Umm google has discontinued updating their page rank logarithm. Today you have to worry about domain authority and page authority.
Because this is a topic that has been discussed a million times already I will try to be short and clear: - There is no more Toolbar PR - Google still measures PR but internally and users will no longer see the changes - PR is very outdated and you should stop focusing efforts on it Shortly said - no, there won't be a PR update in 2015 (not one that you will see at least)
Well, now google more focus on there visitors and quality websites, PR is different matter and its no use for user's point of view, try to concentrate on your on page SEO and make your website user friendly, really hard to say any update of PR in recent time...