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Totally normal. Mine arrived UPS when I preordered. Apple is probably trying to divide the load up rather than putting all the work load on one carrier.
 
My iPhone 5 and iPad mini shipped with UPS... sad that I didn't get to see FedEx guy on launch day - we're sort of neighborly friends lol

Nothing to worry about - my mini arrived via UPS despite previous orders (including the iPad 3) arriving via FedEx.
 
My mini order was shipped FedEx last month. Wish I had a choice when I placed the order. Would have gone with UPS. Brown is better in my area.
 
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