CBS have released an image of the nova from "All Our Yesterdays"
The supernova was one of the previews shown at the SciFi Summit last weekend, and it is spectacular.
From CBS’s description:
For the supernova explosion of Sarpeidon’s sun in "All Our Yesterdays," the Star Trek Remastered team was inspired by photos of the Crab Nebula from the Hubble Space Telescope.
Image courtesy of StarTrek.com. We expect s to get a higher res version of these from CBS, so keep an eye out for an update.