Judging by the tweat (https://twitter.com/#!/unity3d/status/176767532936605697 https://twitter.com/#!/unity3d/status/176767532936605697) it seems like permanent

Judging by the tweat (https://twitter.com/#!/unity3d/status/176767532936605697 https://twitter.com/#!/unity3d/status/176767532936605697) it seems like permanently free!