It's still working as of today and as said will continue to work.
A few points of clarification on Lowfyr's post...
Step 1: log into the STO website (
[Only registered and activated users can see links. Click Here To Register...])
Step 2: Go to Support / Redeem Key (
[Only registered and activated users can see links. Click Here To Register...])
Then follow as Lowfyr directed. The options will show up in the customize options of your toon at the Tailor.