Is it true that Stalhrim armor is the new number 2 in the heavy armor class, thus outranking Dragonplate?

You do realise you could have found http://www.uesp.net/wiki/Dragonborn:Stalhrimin 10 seconds using Google?

Either way, yes, Stalhrim heavy armor is the new second best in the game. It offers the same protection as Dragonplate, but is lighter.

Pffft. My Orc just made herself some Heavy Stahlrim but I'll be updating to Dragonplate once the opportunity presents itself because I don't want to dress like a smurf.