My terminal SNP was determined to be R-S856 at FTDNA. At the time I tested I was negative for any known subclades below S856. I just notice two new SNP added under S856 on the FTDNA tree. They are marked in blue (labeled "downstream"), does this mean I might be positive for this new SNP?

Here it is

Just tried to buy the next snp pack to take my DNA further and it says I don't qualify for this pack. Am I doing something wrong? Can someone advise me?

With closer look it seems that they have found 20 common SNPs from two kits (id:HG00105 GBR and me) and chosen one from there for their haplogroup name?

Simo,

Here's what was shared with us by FTDNA management as to the content of the Z253 SNP panel. I suspect that some additions may have been made, but I do not have that chart/list.