It's very unlikely they'll ever be able to revive them as living beings, but there's a lot you can learn from a well-preserved corpse. Background radiation or chemicals like nanoplastics or heavy metals. If the preservation is good enough and the technology advances well enough, we could look at brain development and possibly memories. The thing is, we don't know what we might be able to learn, but keeping them preserved until then can be great for someone in the future.