0. I like it. I think it looks clean and minimalistic. If we were to compare, I'd say hubski is to social networks what Google was to search engines when it first hit: simple and full of white space, even though the columns are quite busy, as lessismore pointed out. However, it might just take a little getting used to. I don't want to be too quick to dismiss it.

1. It looks like TweetDeck. As such, a columned (if you will) arrangement will typically invite me to assign different functions to each column. Of course, that could be customizable for each user. Also, rustle's suggestion of framing the post is one I second, if just as an experiment.

2. The distance between the top and the bottom of the site is smaller. Which I appreciate. I like to scroll less.

3. The new sign-in page. The blue one reminds me of Earth and the red one, of Mars, which is cool.

That's about it. As an aside, I found a little deviation in the about page:

Likewsie, if someone likes what you post and share, they can follow you and receive your hub posts in their feed.

Edit: I just noticed there's no "save" button in the feed page. I think it should be there.