If this usage of "to be" is in the present tense, it could be implying that there "may be" an existing delay. Such was the argument in the May vs Might in Sentence question. According to American Heritage Dictionary (online,) "might," when compared to "may," is able to represent a conditional clause in future tense. In the context of your question, "might get" may imply that a potential delay could occur in the future, but as of the time of this announcement, there currently exists no delay.
Without additional context, I can only provide this one possible usage/ difference between the two.
Additionally, if anyone cares, I believe that the question is representing two hybrid usages. The accepted usage in the question linked above of each usage seems to be more conducive to "might be" and "may get." In that case, "might be" is most likely implying an existing delay, and "may be" could be a conditional future. Again, without additional context, it is hard to tell.
Might get delayedcalls attention to the (human) factor which is causing the delay.Might be delayedavoids doing that to an extent. – Tushar Raj Jun 11 '15 at 12:50might be delayed, thebeis unobtrusive. The thing that jumps out isdelayed. If you tell me the reportmight GET delayed, I immeditely start thinking that something or someone is responsible for the delay. (This is certainly the case in the former phrasing too, but it's not highlighted). Of course, all of this is just my opinion. – Tushar Raj Jun 12 '15 at 08:22