Thank you John-
The helpful folks of the ABA provided a lot of insight for me on this matter. The real crux was access device vs. EFT service point. AS you pointed out it isn't a new access device, but the mobile device does count as an alternative EFT service point so there could be a need to redisclose depending on the functionality and what was in your original disclosure.
Our mobile product is pared down, no adding payees of any sort, which would be a concern if our initial disclosure had described that feature as a specific function of the online banking service (since bill pay and transfers are EFT's). Fortunately we didn't get that specific in the initial disclosre so based on my unique circumstances a summary of their feelings is that redisclosure to existing customers isn't exactly needed, but new disclosures are.
In any event once we finalize our "new" disclosures I will probably spend the postage and redisclose to current online banking users. We live to fight another day...
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In life, there is a lot less that could get better and a lot more that could get worse.
MBA Fin/MBS HR
My views only!