Right now there aren't any definate signs, but due to the past history and schedule that google somewhat follows an update is due during this time frame.
Of course no one really knows when the update is going to happen, except google, but these are the times that I and many other
SEO's and webmasters that I know, have estimated as being the most likely time for an update.
Google has proved evryone wrong in the past and its not uncommon for them to update whenever they want, so they may do so again.