Could Edward Snowden be next on the list for release?
Hard to say, but doubtful. At one point Trump referred to Snowden as a traitor. Then as president (the first time around) he mulled the prospects of a pardon, but of course never went through with it.
https://san.com/cc/support-of-edward-snowden-pardon-grows-as-2nd-trump-term-nears/Its actually a much bigger can of worms than Ross to deal with as a politician, given the implications of what such a pardon could mean (whether or not its OK to expose government secrets in certain instances).
At the end of Trump's first term, he was about to get impeached, and a controversial pardon could have gotten him convicted.
If Trump gives Snowden a pardon, he will do so towards the end of his term, close to inauguration day.