Why can't AirDrop on new iPhones work with AirDrop on new macs?

IOS7 lets you AirDrop files between phones, and Mac OS 10.8 has had an AirDrop feature for the last year or so, but why can't I transfer a file from my phone to my laptop and vice versa easily?

Just not available… Yet. I'm sure in the near future Apple would expand the limits of AirDrop. Could be this coming Tuesday for all we know.