E3 is just around the corner, which means some big announcements are on the way. Despite the best efforts of publishing giants like Nintendo, Sony, and Microsoft, E3 surprises are often leaked in some form or another ahead of the big event. One way this can happen is with the discovery of newly-filed trademarks, which can sometimes indicate in-development titles.
With this in mind, some recent activity from Nintendo is pretty exciting. The company just applied for four trademarks, all in the categories of "video game program" and "downloadable video game program." The games included were Mario Party, Paper Mario, Dr. Mario, and Punch-Out!!. It's possible that Nintendo could be planning either new games in these franchises or re-releases of existing titles.
Another thing to keep in mind is that Nintendo will be meeting with investors tomorrow (depending on your time zone) to discuss the company's earnings for the past fiscal year. These corporate meetings generally focus on finances and business strategy, but Nintendo has been known to make surprise game announcements from time to time.
Source: Japanese Nintendo