user30017: I can see transactions with version 0
Are there any other versions of SegWit proposed or in existence?

user5406: The introduction of Schnorr signatures would require a new script version.

user64730: BIP-114 which was published a while ago comes to mind :
https://github.com/bitcoin/bips/blob/master/bip-0114.mediawiki

30017: <p>I can see transactions with version 0
Are there any other versions of SegWit proposed or in existence?</p>
 5406: <p>The introduction of <a href="https://github.com/sipa/bips/blob/bip-schnorr/bip-schnorr.mediawiki" rel="nofollow noreferrer">Schnorr signatures</a> would require a new script version.</p>
 64730: <p>BIP-114 which was published a while ago comes to mind :
<a href="https://github.com/bitcoin/bips/blob/master/bip-0114.mediawiki" rel="nofollow noreferrer">https://github.com/bitcoin/bips/blob/master/bip-0114.mediawiki</a></p>
