Currently, public sub counts are abbreviated in most but not all places across YouTube. In August, we’ll make this more consistent by always showing abbreviated sub counts publicly. Creators: You’ll still see your full sub count in Studio! Learn more → http://yt.be/help/abbrev-count …pic.twitter.com/pmaKk4EU4k
also abbreviated sub counts will most likely break http://socialblade.com . it will make it less detailed so you can't really see how much subs someone's youtube channel got