In the future tense, "will be able to" is more correct than "can." In the example you gave they're both interchangeable, but "be able to" is always more preferable in the future tense. Plus, "be able to" is generally seen as more formal (again, this is when compared to the word "can." In your particular example, again, both are fine and I always prefer to say things more succinctly when possible, but there is a definite purpose for "be able to.")
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