Hi all,
Some users are reporting that the game will sometimes bring up the Steam notification that reads "Preparing to Launch" and then nothing happens. We'll be looking into anything our side that could be a cause but please also be aware that there is a bit of a history with this occurring within Steam.
One known solution is to do the following:
"Close steam, then relaunch it directly from your C:/ install folder, but by right clicking on the .exe and running as administrator."
There is also a Steam Support topic that covers other solutions should that not work;
https://support.steampowered.com/kb_article.php?ref=6218-USFX-5568
Feel free to discuss this topic here:
http://steamcommunity.com/app/332310/discussions/0/615086038668880861/
Thanks,
Chris