Galaxy Alpha development at XDA can not exactly called on-the-roll as not a lot of people are buying it. Nevertheless an XDA developer member has released a custom firmware for it that is prerooted and zipaligned.
* Based on Latest Stock 4.4.4 Samsung firmware G850FXXU2BNJ3
* Prerooted, Zipaligned
* Full Deodex
* KNOX Free
* Init.d Software Support
* Insecure Stock Kernel with Init.d Support
There is only one problem with it – when you reboot it, the firmware forgets the Wi-Fi password. For that you will have to modify build.prop and change "ro.securestorage.support" from "true" to "false" and then it everything will work fine.