First off, I'm not sure what you mean about working together. You might be implying (because you use the word collusion) that they will share information about specific applicants, and there is NO WAY that this is going to happen. ABSOLUTELY, POSITIVELY NO WAY. It might even be illegal.
Ask yourself this: Would it change my opinion/ranking of a school(s) if one of them gave me an offer early? If you really want to go to UT-H, but UT-H doesn't give many pre-match offers, and you, instead get an offer from A&M, you're just going to sit on the offer from A&M, rank UT-H first in the match (because you can't lose your A&M offer by doing so) and see what happens. Getting the early offer from A&M isn't going to make you like them more. If UT-H acted the same as A&M, and made you a pre-match offer, you'd just accept that offer and dump the A&M one. Since presumably you'd match to UT-H (in the first scenario,) the outcome is the same. Again, I see clear value for applicants to potentially gain acceptance to their first choice early, but to schools, the only [dubious] value is that they only know who WON'T be attending their school a bit earlier. I think that this is why MOST schools were AGAINST the new rolling admissions policy.
But, yeah, it will be interesting to see what will happen come Nov. 15, since we are the guinea pigs.