I would like to point out that in the three detachments they previewed, no LoW was permitted. So, at the smaller points level, it will be hard to get in a LoW. Furthermore, if we assume the detachments continue to scale up until LoW is an option, the mandatory choices also scale up.
A brigade requires a ton of investment, and even at that point there is no LoW. 3 HQ, elites, fast, and heavy, with 6 troops mandatory - that effectively removes LoW from low point games. And at a Brigade level, there is still no LoW.
This is a very good thing IMO, as for the fun of it I ran a WraithKnight in a 500 pt game the other day. (Was vs my brother as a try to Screw you). That is beyond broken.