I just haven't had a lot of time to keep up on the forums or even play lately, though I have still been avidly collectly and watching newsfeeds... but I had to hop on and get the forums' read on the new Wraith units for Waiqar. Based on what I'm reading for the charge rules (#16), a unit of wraiths could sit hidden behind a unit as a shield, and potentially zip through that unit to charge an enemy unit, using its special to ignore the allied but -choosing- not to ignore the enemy unit. This prevents them from colliding with an ally, which would have caused stress (16.2), and allows them to trigger the free attack etc from successfully colliding with an enemy unit during a charge (16.3). However, I have two scenarios that come to mind when I think through the strategies:

1) Screwing up the 'landing zone' size: What if your charge doesn't leave you with enough room to place the unit on the other side? If for instance you are two-trays deep, and there is only room for 1.75 trays? This means that you aren't able to place the unit obviously, but what do you do then? The answer would make sense to reverse your movement along the path until you are not in contact with the enemy unit, and place your unit so that you are behind your allied unit. But, you ignored them for movement, so you didn't collide, so are you still touching or not? Seems like we need a clarification there...

2) Flip Charging: When I first saw the Wraiths, I was hoping there would be some way to have a unit of Reanimates charge in to pin an enemy in combat, then charge the Wraiths through both units, flip with their special ability, and then count as charging when hitting their rear flank (and they seem like they were originally written for this). However, my RAW interpretation is that it wouldn't work because: you didn't collide with the enemy unit (16.3). By choosing to ignore them so you can pass through them, you are not counting as "colliding", so the free attack never triggers, and you can't lock up the bases. The only way to do this would seem to be as two rounds of movement: March through both the ally and the enemy and flip on turn one, then charge during turn two. Still a very powerful option, and it gives the enemy more chance to respond and avoids Problem #1 above from occurring as easily if you have to allow extra room for the "landing zone".

What are your thoughts/strategies/suggestions?

Wraith Article for reference

I advise you to check out the Wraith reveal thread, as there was much discussion of your second question. Current consensus is that you can end your movement TOUCHING but not OVERLAPPING the enemy unit, thus allowing you to perform your free reform (you can reform while engaged) and attack. In order to pull off such a precise move, Metered March is all but required.

As Contrapulator mentioned, this has been gone over thoroughly in the reveal thread.

To answer one question though, specifically not colliding because you "ignore" the enemy unit.

Collision happens either when you overlap during movement, or if you are touching AFTER movement. If you choose to ignore the unit DURING movement and fail to jump over them, assuming you don't have Metered March, you would then slide back along the template and stop touching the unit, then you would collide.

Ignoring a unit DURING movement doesn't mean you can't collide with them. Movement is just one phase of an activation.

Right, even if you ignore an obstacle during movement, if you're overlapping something after movement you still need to deal with that collision.