I can't seem to find the answer to this question either on bitcointalk or elsewhere on the internet.

When Eth goes proof of stake, is there already in existence a designated wallet from which holders can stake it?  At the moment I'm holding my Eth in a hardware wallet but I'm sure I wouldn't be able to stake it from there.  Does anyone know about this and perhaps have a link, or is this something that is so far unknown?

I also can't find an answer to when the pos change is supposed to be made.  I saw a thread about this earlier but there was no link and my searches turn up old articles.  Thanks.