Iím 99.9% sure that heíll get it. Though I am slightly confused as I thought it was for members of the wider ROYAL FAMILY rather that the ROYAL HOUSE. All of CG sisters still have it and only Birgitta is still a member of the Royal House.
The whole family vs house and royal with HRH vs royal without HRH is very confusing. Not that I always agree with countries that have firm rules but this loosey goosey at the Monarchs pleasure method leave a lot to be desired. I get why CP and Maddieís kids got all the perks, and why the perks were then limited, but lack of strategic planning and long range think always bothers me.
I believe that there has never been a distinction between the Royal House and Royal Family so it never mattered before.
However, one must look at Christopher and his decision to not take a title. He is a member of the Royal Family but not a member of the Royal House. Thus, he was granted the Order of the Polar Star upon his marriage to Madeleine.
Julian, unfortunately, is the first child born after the new rules took effect. Following past precedent, he is technically not entitled to the Order of Seraphim as he is not a member of the Royal House.
I believe this is also why CG decided his christening will not be televised.
But, yes, I think he will receive the Order as well.