The greatest buff new Sejuani could get is to have some way to deal with counterjunglers
Since 90 percent of my games are against Lee Sin and Graves jungle, I rarely have ever played Sejuani (my second favorite champ) this season. That is the only thing I care about in the update. Some way to escape/survive long enough not to get destroyed in my own jungle before I can clear my camps/buffs 1 time. Sadly enough, when an enemy has picked Sejuani (rare pick) I know we have won the game because I am going to harass her 24/7 and starve her into not contributing to her team.