These are for theories that I think up of, but are too esoteric and specific that it wouldn't warrant its own thread. (Will likely update this thread when I have new theories, but won't bump it up until I have at least 3 new ones. If that's allowed at least)
Theories are bolded, explanations are afterward.
Here we go:
1) "[...] It didn't scream." Would be either a chapter ender or a POV transition in a later Stormlight Archive book.
I can imagine a scene where a Radiant, most likely-definitely Kaladin is fighting another Shardbearer, when he accidentally touches the opponent's sword somehow, he doesn't hear screams. This would imply that the opponent is either also a radiant or has an Honorblade.
2) Kaladin will use Syl's Shardform to better effect and augment his fighting style.
I can see Kaladin using Syl in spearform as a ranged attack, extending the spear's shaft, maybe even being able to wrap around to home in on targets.
3) Eshonai will be able to exert her will on stormform (also she's still alive after that fall)
Temporarily or permanently. The screaming self will be able to wrest control of her actions and intentions at a critical moment.
2017/11/11 - Only two for now, I'll reserve the larger theories for actual threads.
2017/11/11 - Added another theory a few minutes after.