If true, this is great news. I don't know why, but I was under the same impression as Jimbo in thinking MLBN would only be available to Extra Inning Subs.
The only sports league that restricts access to their 24/7 channel that I'm aware of is the NBA. You either have to have the NBA League Pass, Sports Pack or Premier. The NFL Channel is available to anyone with Choice or above and the NHL channel is available to Choice Xtra/Plus DVR/Plus HD DVR subscribers (or above).