I applied a Collector's Edition code (from Amazon) to my free-to-play account and got the following:
a. Red Matter Capacitor (Claim via Z-store legacy unlocks)
b. Liberated Borg BOFF (Claim via Z-store legacy unlocks)
c. All the Gold membership perks (extra account bank space, bag space, character slots, BOFF slots, ...). I imagine this will last 1-3 months.
d. Probably a bunch of costumes (I'm happy with my classic DS9 costume, so I didn't explore the Tailor much).
If yours is just a regular edition, my guess is that you will get (c) only.