Higher gain, longer distance, can be used on other routers with RP-SMA connectors.
Model: Linksys WRT004ANT
Frequency: 2.4 GHz/5 G Hz Dual Band
Antenna Gain: Up to 4dBi on 2.4 Ghz Band, up to 7dBi on 5 Ghz Band
Radiation: Omni directional
Vertical Beam width: 300
Connector: RP-SMA...
I mean the fact that they released a matching WRT AP the first time around, it'd be a huge mistake if they don't.
Probably a licensing issue from Apple, but if that ever gets resolved it's a simply a matter of updating the firmware.
Just to be clear, I doubt Linksys is going to drop support of the WRT1900AC v1 due to the fact that they know they can't afford to alienate the customers who made the gamble and shelled out the cash for it when it was released last year, by being told it's end of life a year later. If they did...
Information, including screenshots of the OpenVPN feature, is located here. http://www.dslreports.com/forum/r30063608-Firmware-New-firmware-available-for-WRT1900AC-v1