Wasn't alpha software just recently released? We actually have a buildable functional kovri for the first time now as I understand it. Seems good.
I confirm that. All the previous releases have the status "alpha-rc", i.e. "pre-alpha". Official alpha has been released just few weeks ago:
https://github.com/monero-project/kovri/releases/tag/v0.1.0-alpha
Monero/Kovri devs do have just one disadvantage: a very... VERY poor PR activity. They often do the great things in total silence. They probably think the github activity is completely sufficient source of a new information for the whole community.
That's good news though, i am eager about the security benefits it brings