Be aware that the Nook lending feature is a publisher opt in feature so not every book may have it (and based on the number that disable the Kindle's "read to me" feature I'd say that's a safe bet). And you can only lend a book for 14 days, and to people who also have Nooks or accepted reading clients. And, unless the announcement coverage was wrong, you can only lend a title once.
If you're lending is most likely to be people in the same household (lending is something I would like to have but recognize I'd never actually use) then keep in mind that up to four Kindles can be put on the same account giving each machine rights to a book with just one purchase.
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