@Basekid: Unless you're using something that somehow messes up the Kindle USB MS DeviceID, the hacks here shouldn't prevent Calibre form seeing your Kindle... (And for the record, it works here, both on *nix & Win7). There's a device detection debug option somewhere in Calibre if I remember correctly, take a look at that
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@bbildman: It will both download & install successfully, yes. In the specific case of the fonts hack, if the K3 features are backported, the hacks will probably need an update to *function* correctly, but it won't prevent updates from installing.