This is what you said. You said you will already have a Premium AP for the WDW trip.
(though in re-re-reading I think you're saying you'll have a Premium DLR AP, which is opposite from what I thought you meant, though I'm not sure it makes a difference)
(problems when posting from your phone, since you can't see signatures)
If you already have a Premium AP, then you want to look at the cost of DLR tickets ONLY
(or WDW tickets, depending on which park you'll already have the AP at), to see if the Premier is worth it.
And you didn't mention that you would want another trip to DLR.
I was posting from my mobile, with no signatures.
Regardless, if you'll already have a Premium to one of them, you just want to look at the tickets you'd buy to the other park, to see if the Premier would be worth it.
At which park? They are better at DL. I wanted to make sure you understood that they aren't equal.
Specific AP discounts at WDW restaurants here:
http://allears.net/pl/disc_dining.pdf Very limited, compared to DLR.
As for merchandise, from the WDW AP site: "Passholders are eligible to receive a 10% discount on select merchandise purchases at Walt Disney World® Resort owned and operated Merchandise Locations." (with a LONG list of excluded stores)
I see 15% off the Rainforest Cafe and T-Rex stores, at Little Miss-Matched (kid's sock store)...everywhere else that's included is 10% at WDW.
I hope you can. I wouldn't assume you can. It's been tried by others before and the policy is that you can't combine two admission media to upgrade to something. Pixie dust for one doesn't mean it'll happen to you. I just want you to be realistic, and be happily surprised if it works.
And really REALLY do the math. I've been trying to make a Premier AP work for me since they started. I can't do it. Doesn't help that we have DVC so we get the DVC AP price for WDW (when we want one), which makes it even less possible to make the math work. And we never *need* a Premium AP for either park LOL.