The website categorizes upcoming games based on their status using color-coding. An explanation for each status is on the right sidebar.
Currently, Runewars: Revised Edition is "on the boat." This means it has finished printing, and it is en route from the printer (e.g. in China) to FFG's warehouse in the US. This process takes 4-6 weeks total. Once it's at the warehouse, it will be shipped to retailers. This takes 7-10 days, and longer if you live outside the US.
This means you should check the website daily to see when the status has changed from "on the boat" to "shipping." On that day, add 7-10 days, and that will be the range when it hits US store shelves. The earliest we will see the game, which would happen if it began shipping tomorrow and the shipping time was 7 days, will be January 25th.
For FFG to make a shelf date of January 31st, the status needs to change to shipping no later than January 24th. Even then, there is a possibility for the game to hit store shelves between February 1st and 3rd with a ship time of greater than 7 days. If the status changes after January 24th, then we know the release date has been delayed until February.
So check the website, add 7-10 days when the status changes, and there is your shelf date.