what it happening on MLB TV is individual team subscriptions for in market games that are separate from the out of market MLB TV package. Most the teams that have gone off Diamond already had their team subscription offers up, but the Tiger one only appeared very recently - maybe today. BUT, before you buy that for $189 for the year, the other half was that they are still trying to get the games on various cable services - TBD. So if you have a Comcast or DirectTV etc, subscription, I think you should hang tight and see if an announcement comes they will be on your system before that March 26 offer deadline to subscribe to MLB directly.
For me, we get so little value out of Direct TV I'm thinking it's likely I'd go with the MLB offer and drop DirectTV for something a lot cheaper