Aside from what other members already mentioned, there are few planned implementation (the idea either from user/developer) on :
1. Multi-signature address (this is obvious application/implementation)
2. Lightning Network, since 2-of-2 multisigature transaction is used when open and close channel
3. CoinJoin (along with various improvement/tweak such as SharedCoins, CoinShuffle, Stonewall and ZeroLink), since AFAIK it could break linking/analysis

And as theymos said, there's no actual BIP for Schnorr since i couldn't find any at https://github.com/bitcoin/bips


I disagree since those who would make ruckus already have their own cryptocurrency and few of them have their own fight consensus. Besides, unlike SegWit, almost no one know about Schnorr Signature/Signature Aggression expect those who interested with Bitcoin's technology.