I want an answer on this too, since i unlocked my phone because ASUS stated several times already they won't update the padfone 2 anyway.. but now they stated that 4.4 will come!! so annoyed
Yes, you will be able to download the update from the Asus website and flash it yourself, simply put it at the root of the sdcard and it should update by itself.
1. Check SW version of your PadFone2 2. Download PadFone Firmware: V11.8.3.3 Only for Your SKU and Update version of SOP (From “Manual” Item)
※Firmware update cannot do * SKU conversion* and downgrade version. Wrong SKU may cause update failure, You can only update your SW version on the Same SKU *How to check SW version of your PadFone2? Path: [Settings]-->[About PadFone]-->Build number Example: You should be able to see the build number TW_PadFone-11.X.X.X, where “TW” means SKU.
PS: Due to this Android 4.4 upgrade would reset your device, please do refer the upgrade SOP to backup your personal data.