Here's the counter mix for Reinforcements, from publicly released material:
[The Reinforcements page on the SJG website shows a good view of the back of the leftmost four columns, except for the bottom two pieces of the 4th column in from the left.
The Reinforcements Add-On graphic from the Kickstarter page https://www.kickstarter.com/projects/847271320/ogre-miniatur... shows the front view of the rightmost 4 columns, including those 2 bottom pieces. The only ambiguity left is whether the two bottom infantry there are 1/2s or 3/2s, since we don't have views of both sides of them. But see Note 2.]
Reinforcements includes 2 apparently identical countersheets of conventional units.
The number in the first column is the number per sheet,
The number in the second column is the number per Reinforcements set.
TL;DR: When Reinforcements is added to O6e, you end up with two precisely symmetrical forces, except that the NAC have 2 more GEVs than the PE forces.
[And yes, it's entirely possible I have too much time on my hands. ]
MHWZ PE 2 4
SHVY PE 2 4
GEV-PC PE 3 6
LGEV PE 4 8
LTNK PE 4 8
MHWZ NAC 2 4
SHVY NAC 2 4
GEV-PC NAC 3 6
LGEV NAC 4 8
LTNK NAC 4 8
HOW NAC 2 4
MSL NAC 4 8
GEV NAC 4 8 //Note 1
HVY NAC 4 8
INF1/2 NAC 4 8
INF2/3 NAC 6 12
INF2/? NAC 2 4 //Note 2
Note 1: 2 less than the PE in O6e, but O6e also comes with 4 NAC GEVs, so NAC end up having 2 more than PE.
Note 2: If these are 2/1s it matches the O6e mix precisely.
Compare and contrast the O6e defender (PE) counter mix:
Per the unboxing video, my counts for the armor units mix are confirmed: 4 howitzers, 8 missile tanks, 10 GEVs, and 8 Heavy Tanks.
For the infantry mix, now that the unboxing video lets us see a lot better, there are 12 three-squad counters with 2-squads on the back, and 12 one-squad counters with 2-squads on the back. Which lets you field 24 distinct groups of infantry, and a total maximum of 60 squads on the board at once.