If you're intersted in reading about specific features in v4, check out the official blog:
http://blog.mortaluniverse.com/
There are currently 3 recent articles about v4, including the latest one today about POP Peeper's partnership with Web of Trust. I would really like to hear your feedback.
v4 News
Re: v4 News
A new blog entry has been posted. This one features the spell-checker and comes with video so be sure to check it out:
http://blog.mortaluniverse.com/
http://blog.mortaluniverse.com/