The folks at Disney Mobile support have not responded to my question about when this problem will be fixed. The original answer, prior to the May 1 v1.2 update, was that it will be fixed in v1.2. When it wasn't, and I inquired again, they went radio-silent. I recommend all of you to ask them as well so that they know there are a lot of concerned users.
With the ceiling on Arena Crates capped at Tier 3, the hunt for Tier 4 promotion items that are exclusively in crates becomes a massive challenge. You can pay gems to upgrade, or you can pay gems to buy Hero Crates -- but what if you don't have enough gems to play the crate roulette?
You can buy Tier 3 Arena Crates and hope for that elusive Tier 4 promotion item. From a sample size of my own crates, 1 out of 3 Tier 3 crates will provide a Tier 4 promotion item; however, that item is not guaranteed to be an exclusive crate item. In the example below, I got an item that can be commonly found in the Special Missions. This further reduces the chances of getting the desired Tier 4 promotion item, but at least there is still a slim chance if you're desperate. In the meantime, send a courteous email to DisneyMobile (especially if you've spent money on the game) and ask them when this will be fixed. Please keep in mind -- a polite question will get a much better chance of a response than a crabby one.
Arena Crate Pricing
Another interesting conundrum is how LucasArts/Disney Mobile calculates Arena Crate prices. Here are the current prices of my Arena Crates:
Arena Crate costs as of May 6:
Other Arena Crate costs:
If any of you can crack any of these riddles, please share the information with everyone in the comments section! In the meantime, enjoy the game and thanks for reading!