Doubtful to see a national feed unless they get more content. Most of the locals have it in SD, when there is an affiliate in that market (unless it's only a digital subchannel, and those markets could get it later on).
Good example being the CW national. They can only give it in areas where there is no CW station, (even digital substation counts against that) or where that local station gives them permission to do so.
there the same feed just maped down