Just got home from Las Vegas and found this interesting information in my mailbox. 
Thanks to DirecTV for the info.

Thanks to DirecTV for the info.
MLB Extra Innings customers with SuperFan that have MPEG2 HD hardware will begin to receive phone calls and/or emails tomorrow....it may take a bit of time for everyone to receive them.
A special phone number will be provided for them to place their free HD Swap to get them up to the MPEG4 standard. This season HD for MLB EI Superfan will all be MPEG4 so these customers must swap to have the same experience they had last year.
This assumes customer is in good standing for them to receive the offer.
In addition, customers without SuperFan but with HD MPEG2 hardware will also be notified of a special upgrade HD swap offer as well.