Wow, it might really happen:
http://www.eonline.com/news/499724/will-the-big-bang-and-two-and-a-half-men-get-renewed-cbs-boss-weighs-in-and-reveals-himym-spinoff-details

And it's apparently going to be called How I Met Your Dad:
http://www.ibtimes.com/how-i-met-your-dad-rumors-how-i-met-your-mother-actress-lyndsy-fonseca-play-lead-role-father-spinoff

It sounds like it would follow the same structure as HIMYM, but tell the story of how the mom met the dad. What do you think... would you check it out?