While nothing official has been said, it looks like the Filmation and the Collector's choice subs will not overlap.
The Triple Ship on those will happen in alternate months as well.
CC's first Triple Ship would be in March
Filmation's First Triple Ship would be in April.
Thundercats is the one that throws a wrench into this. Seeing as that one is during the last 6 months of the year (Jul-Dec).
The first shipment never combines for DR. So, two out of 3 TC Triple Ships will be separate, due to the TC sub not being able to combine with the other two subs (Once with Collector's choice and the Other time with the Filmation Club) The Final Triple ship would combine with Filmation.