Oh dear, so the undead will be weakened and the space elves will run riot. Oh dear god the horror... the yellow fruity horror...
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Tau already has the love with that new Arka Cannon, far different from 1.59 and the current unreleased. Tau is too strong. New units all they will ever get from here on out. Unless you want unbalance... 
Nids you say? Daemonhunters and Nids will be released at the same time. XP2. Here's XP2 if you forget what it is. (Expansion 2)
Krronus's hope for XP2
Hello fans. XP2 (New Races) is our biggest goal. That's right, new races will later be available for 1.6. I really hope so anyways if we are allowed permission from the creators. (Which as of right now, we were granted permission.) The new races we hope to see are the Tyranids of course and the Inquisition Daemonhunters. We will per-fect both races for the Apocalypse and add the extra features to them like we did to the other nine races in 1.58 Actual. Though I fear it may take another month or two or three. We are basically applying the same stuff to both races like we did in Apocalypse 1.0, 1.19 and 1.58. All of their buildings will have build radiuses, all units besides the major units will be unlimited, all builders will be set to the required cap limit, all commander wargear will be available, all codex weapons will be done and both will contain superweapons and tier IV, V and VI. But it will take a while.
The Apocalypse mod team strives on to make all of you satisfied.
And for the poll Krronus posted... Looks like I'm taking my time and 'per-fecting' it with awesomeness since the score was 3 to !!!21!!! But don't get your hopes up no, no, no. It's worth the wait.
Yes I implied, it's an expansion for 1.6. XP1 1.6 is as well. So... separate mod. Hope that answers your question.
Jesus man! We're at 170 posts already!?!?!?!?!