Last year was the first softball season for me with Insight's digital cable package. With all of the sports channels they have, I was glad to see that there were plenty of softball games telecast throughout the season, at just about anytime of the day or night. There are about a dozen regional FOX Sports channels and many of them featured softball. Locally, the Columbus Sports Network (CSN) showed both Ohio State softball, as well as a handful of Akron Racers professional games.
The Big Ten Network wasn't available until fall, after the softball season was over, so I'm not sure what their softball programming might be. I looked at their web site, but apparently there is no way to check their listings that far in advance, or search for specific sports on their schedule. As another poster noted, with all the other "niche" sports they cover, you would have to imagine that softball would get some coverage.
Either way, it won't be long before the season gets going and we find out for sure!