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Matt, you may have seen some of the posts I've made about this feature both here and at Kindle Boards.
With the K3, if wireless delivery is made via Wi-Fi, there's no charge. If delivery is made via 3G, the $0.15/MB charge applies. This hasn't changed.
However, if you set your personal spending limit to $0.00 then Amazon will never send a document to you at your @kindle.com address, because it would be over your limit, instead routing it to your @free.kindle.com, where delivery is free. This also hasn't changed.
With the introduction of Wi-Fi on the K3, in addition to sending your documents via e-mail so that they can be loaded onto your Kindle via USB, they are also sent via Wi-Fi. Since there is no charge to Amazon if you utilize Wi-Fi instead of 3G, the delivery via Wi-Fi is free.
If you had your Wi-Fi on and the document was delivered, it never had the chance to send it via 3G because when Wi-Fi is on, 3G is turned off. If you "forget" your wireless connection, this will force it to 3G and you may get charged if they end up being delivered via 3G.
This wasn't "without announcement", this is the way that it is documented in the User's Guide.
(emalvick beat me!)
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