There were previous statements that one of each type would be built, then a *second* of each type, and *then* the main production run. Something to do with iterative testing.
Anyway, this is my wild and uninformed speculation based on the assumption that there will be *two* test cars of each type, and that they'll be ready to use in revenue service before the main production is ready:
I think the first two diners should go on the LSL (to give all three sets Viewliner diners)
the first two baggage cars on 66/67 (to allow them to get up to full speed on the NEC),
the first two baggage-dorms on the Cardinal (to alleviate the crush on sleeper space and allow it to get up to full speed on the NEC),
and the first two sleepers on the Cardinal (only train where you can test the new "fewer roomettes" sleeper arrangement using only two cars, without confusing the reservations system).
Once the main deliveries start, I'm sure Amtrak will be trying to displace Heritage diners ASAP.
If I were Amtrak, I would try to put new baggage cars on trains running on the NEC first (to allow full-speed running). If so, some of those baggage cars would be displaced by bag-dorms later, and only then would the baggage cars start to migrate west.
Now we wait and see what actually happens.. It sounds like full-scale deployment will be mostly happening over the 2015 fiscal year, not the 2014 fiscal year, unfortunately.
2015 should be an interesting year for Amtrak... if any projects manage to stay on schedule (waaaay too many have slipped).