I don't think it's for nothing and for good reason. They are literally keeping the details of two extremely important modes for the franchise away from the customers LESS THAN ONE MONTH away from release. There is no reason any company should do this, especially to it's loyal fans over the years. ****, at least Destiny announced all MP modes and locations (basically) at Gamescom, and that's a new ****ing IP.
NHL 15 will be released 3 weeks from tomorrow, and more than likely within this week or the beginning of the next, it will go gold, which means the programming is done and the game will be put on the physical medium and ready for shipment physically and digitally. If a company as big as EA, with a following as big as NHL (even though not as big as NFL and FIFA, sadly), can't tell us the details of the game way earlier than this, then it is a huge deal.
We may still buy the game even if both are in it, but we won't forget what they did and how dickish they were about keeping the details till the last minute.