Well the Blog was only about the Intel Ships, so thats why the Guardian cruiser wasn't in there.
One assumes that to be correct, and it's certainly possible.
But the fact remains: Of the 8 thus far revealed ships, 7 were Intel ships, and 1 was the Guardian Cruiser. I don't know if the Guardian will be a FREE Tier 6, or if it will be purchased for Dilithium. But 8 ships, in a line-up of "6 to 9 ships for launch", suggests that we pretty much know every ship that we're getting for launch. Which also means, they are effectively trashing the idea of having 1 ship per career (1 Escort, 1 Cruiser, 1 Science Vessel), and then possibly running this Guardian Cruiser as a "multi-role", capable of being flown/fitted for all 3 play-styles. Time will tell.