Twitter: Soon adding “Nifty” site features

Twitter appears to be on the verge of some big changes to its website if a tweet that Twitter engineer Alex Payne sent today is any indication. In fact, the new features may be so good that they could make some people re-examine their use of desktop Twitter clients, apparently. As Payne writes:
If you had some of the nifty site features that we Twitter employees have, you might not want to use a desktop client. (You will soon.)
Not surprisingly, that tweet had a few third-party Twitter developers worried.