All we can do is wait
It'll be interesting to see who starts leaking, and how, and when.
If any of this information comes out within the next year, then it's a safe bet that whoever is doing it is trying not to damage the Republicans' chances in the next election. They may be shit-stirring for other purposes, but the timing would be designed to minimise electoral consequences.
If it comes out in mid-2020, that would look like more of an attempt to target the GOP's election chances.
If it all comes out at once, that would suggest a probably-naive, idealistic user who just believes in the Wikileaks ideal of "no secrets". If it's drip-fed week by week, that's someone trying to manipulate the news agenda. (This was my biggest beef with how Wikileaks itself handled the Clinton emails - the process they used simply wasn't consistent with their stated mission.)
If it doesn't come out at all by the end of 2020, then it's either routine opposition research by - whoever, could be anyone from the DNC to Mossad - or it's someone trying to either blackmail the RNC or to sell them a security service, or both.