Kano - Tokyo Retro (Oracle) [Insane]
naotyu- - Velaciela (Jacob) [Pokie]
FELT - Closed Wings (Sylith) [Lunatic]
Eagle - S!ck (tsuka) [Extra]
SirensCeol - Nightmare (Maxin Remix) (galvenize) [Another]
yuikonnu - Byoumei Koiwazurai (litoluna) [Insane]
yuikonnu - Genjitsu Game (Amamiya Yuko) [captin's Insane]
Nekomata Master+ - Kung-fu Empire (Damnae) [Backdrop]
Mikakuning! - Tomadoi Recipe (Fycho) [Insane]
Something to note is the relative ease of the nomod maps compared to the mod maps. We (I, mainly) were going for a consistency test more than anything, for the first round at least. That's not to say that all rounds are going to have easier nomod maps than modded.
You won't need to individually go through the links and download each map one by one. I've prepared a map pack with each map having an identical, unranked difficulty saved as "[NAT1]". This is for several reasons. The first of which is last year we had some players not really wanting to go over their own scores on a map just to participate, thus they dropped out. The second being that as we are using [some] unranked maps, to prevent confusion in the event that a mapper updates his or her mapset, or if a qualified map is disqualified, there will be a common copy of the map for everyone to play on.
The osz package does not contain videos, storyboards (sorry Damnae! I highly suggest you go download Kung-Fu Empire with the epic storyboard!), or other unranked difficulties. You will need to redownload the mapset from the links above if you wish to have all of these extras. They will integrate with your current song folder if you have the map already and hopefully not overwrite anything important. Depending on how this is received, I might make changes to this method of distributing the map packages.
tl;dr: You will play the NAT1 difficulty contained in each osz package inside the map pack. You can practice on the ranked or pending version but I can't make any guarantee that nothing will change between now and the start of round one.