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You are not alone. Many steemians have mentioned this .co issue.
It's probably just a way to generate comments because it certainly did that.
Maybe it is as simple as the domain was already taken?

It's not the problem with the domain and the subdomain should also be no problem. It's just a little strange to change a domain from .com to .co
This is the is the TLD for Colombia. I don't know what to think about to transfer the wallets domain in a other country than steemit inc.
It can really be that it's just about generating more traffic, but for me it's still very suspicious.

The website is now showing as a .com url so maybe stinc has taken peoples concerns about using this .co sub domain and updating the website?
It is a little weird imo and a bit more clarification from stinc would have been helpful.

It looks now more consistent and "safe". If the login of my bank would have a .com.de or .io domain instead of the .de domain on the main page, I would not write my data into login. It really looks like a phishing site.
Somehow I miss also proper information to the new Wallet. There are a few small posts but nothing that I think looks like real info. Something like this should be pinned so that everyone can read it.

I totally agree. Here is the post from @steemitblog announcing the soft rollout of the new steemit wallet.
It is very low key for such an important move.

https://steemit.com/steemit/@steemitblog/wallet-app-soft-roll-out-is-live

Thank you for the link Michael :-)

It is very low key for such an important move.

That's true, this should be way more public and visible.