@Tikitoi - GREAT card, rare mailer. Hang on. This isn't the grAAvy train, but the grTYTYvy train. Premier points can be used in Citi's portal at a redemption rate of 1.25 cpp. They do have Disney hotels, although the rates seem to fluctuate wildly when I check them every so often. Definitely deals to be had.
The reason more people don't talk about this card is because TY points are hard to accumulate given Citi's restrictive anti-churning rules. The difference, of course, is mailers. AA mailers are discussed much more widely because they are readily available and fairly easy to get if you want. Premier mailers? They don't come around very often.
It's up to you if you want this card, but this is what I would do: apply for the public offer for the Citi Premier on Citi's website. It's the exact same 50,000 TY points after $3k spend. Get that card, wait 60 days (to be safe), then apply for another one using the code in your mailer. That mailer bypasses Citi's anti-churning rules. Also, there are targeted offers out there for 60,000 TY points - there's a decent likelihood you will be match to that offer on both cards.
60,000 + 3,000 + 60,000 + 3,000 will net you 126,000 TY points, worth $1,575 when redeeming through Citi's travel portal for hotels. You can also transfer to airlines. Or, a little known fact, you can cash out those points toward a mortgage or student loan payment at 1 cpp by calling Citi. It's a little weird because it's a check sent to you but made payable to your bank, but it worked fine when I did it last year.
Definitely look into the card more. I think this is a very valuable card that shouldn't be missed, obviously.