I am most interested in the continuation of the Premier steam line with 2-rail option. I am glad that Atlas didn't acquire those products.
In HO, the product lines they purchased have taken years to get to market, and then only a small percentage of the models have seen the light of day.
And in N, which I dabble in, the Atlas quality has become hit and miss - with much more miss. More than half of my last 10 Atlas N locos were dogs. Some went right back to Atlas. One they could never get right. For now, Atlas N locos are off limits for me. Not worth the risk.
Let's hope the MTH quality is maintained... and that we will get 2-rail models with pure DCC electronics.
Hopefully the MTH/Atlas transaction will be beneficial to Atlas and the modelers.