It appears that the features that Twitter staff had hinted about is appearing on the Twitter.com web site slowly.
I noticed now you can row your cursor over someone’s @reply reference, a tip box showing the individual’s profile will appear.
There is also a “more” link where you can expand the individual’s profile information to review his biography, number of tweets, followers and following.
While the actions menu is still available at the bottom right of the popup window to allow the user to follow, un-follow, block and report the individual.
I look forward to seeing what other features the Twitter team is cooking up.