Hi.Let me answer the best I can. I am also a ELITE Premium PS3 members.
For MW3 content Season if your part of this world, you can CLEARLY see that the MW3 Content Calendar has a "xbox" and "ps3" section. PS3 season is clearly outlined there.
We get content before the genral ps3 folks.
Our season goes from Feb-Oct.
Feb- Liberation & Piazza
March 29th- Overwatch
April (exact date TBA): Black Box, Black Ice, Negotiator
April - Content Collection 1 for everyone else on PS3 and PC.
The season continues on like that.