The new stickers are the following:

: curemoji_shyness

: curemoji_shocked

: curemoji_letsheckinggo

: curemoji_eye

: curemoji_eyes

: cowblush (originally discarded emoji for the cowpoke set, now making a return!)

The returning stickers are the following:

As every month passes by, the set of returning stickers will change, so there's always a chance to get ones you didn't get in time!

Also, because you opened the article, there's also a new redesigned sticker, for CowHeart specifically, making it look more like a heart

While CowHeart has been redesigned, due to the sheer amount of existence in them in these last few months (sorry for that), it won't return right now nor in the close future, once more sticker sets come out it may make a return along with the rest of the cowpoke set