For all of you wanting to update to 4.13 using the marketplace installed version. It is coming, but Epic is having a slight technical issue that will take a little time to work through. If you want to go ahead and move to 4.13 you can download the marketplace (or even a newer version) from github at the link below and install it either to your engine plugins folder or your project plugins folder. Instructions for this can be found on the github wiki.