Be a GM needs a complete overhaul. Here's my ideas.
-Make the trading block more accurate. It was a step in the right direction but you should be able to do more with it, like choose the actual position and player type. For example, say I want 2nd line forward, okay well NHL 13 lets you do that but what if I want a 2nd line right winger sniper? Well NHL 13 does not let me do that, I should be able to choose from right wing, left wing and center, and I should be able to choose his player type (sniper, grinder, defensive defensman). Also, you should be able to match what your willing to give up, for each of your needs. Say I'm willing to trade Sergei Gonchar, but not for that 3rd line center I want, I want to trade him for that 2nd round pick I need.
-Make GM mode more, dynasty or franchise mode. Add relocation as an option, or coach firing, make attendance play a factor and ticket prices.
-Bring back the messaging system, I really liked opening my message box in 2008, it made it feel like more of league. With this you could add in the winter classic into Be a GM, and you will get a message saying who the winter classic game will be. Add power rankings into the game that changes every month. Maybe it can also tell you who the top three candidates are for the trophy's are, and that could change every month as well.
-Make the trading less stupid and add a little depth to it. Make it so you can tell the other team what you don't like about their deal and make it so there less stupid and add a little depth to it.
-Add team and player momentum and rivals. Momentum can be built up with a big win and it can cause winning streaks however loosing a big game can bring you r momentum down and it can cause a loosing streak. Momentum for your team and the opposing team can be shown before a game measured with a bar (red representing a hot streak and cold representing a cold streak). Also rivals could also play into the momentum, so if you win against a rival team, then you gain momentum. In a rival game the intensity level is much higher and they'll be bigger hits, higher fight frequency, scrums infront of the net, players running star players and the goalies.
-Line chemistry should also play a factor, kind of self explanatory.
-Players should have blocked shots as a stat (the game recognizes them) and also how many points and goals they have in their last 10 and 5 games.
-The ability to save lines
Creation Mode:
-The ability to create third jersey would be pretty cool.
-Add more content to create a team, seriously it's pretty bad compared to some other ea titles. Add more logo's, more city's more names, way more jersey templates (or the ability to create your own), the ability to create your arena (striping, logo's, boards, colors, goal horn, goal song, jumbotron.), secondary logo's etc.
-Create a player is terrible. Take the Fifa create a player and put it into this game. Add the ability to wear no helmet's.
Gameplay:
-Fix the hits, seriously. the other team strips the puck away way too easily when your defense men are pylons.
-Stanly Cup celebration sucks, fix it.
Legends mode: Actually make it so you progress through which ever legend your playing as caree. Say if I play as Wayne Gretzky, I want to actually get traded to LA after a certain amount of seasons. Also take the goal system from be a pro, and use it on this, so Wayne Gretzky's goal for one season will be "we want you to get 92 goals out there" and each time you complete a legend goal, it will count towards you becoming a legend.
Other:
-Playoff beards, it just adds that much more realism, or in create a player have the ability to check off Playoff beard.
-Add Legend teams, instead of just plain old legend players. Every team could have one, for instance, Anaheim's could be "07 Ducks" or "03 Ducks" Complete with the teams roster that season, some team might have more than one legend team.
-More jersey's, every team should have every single jersey they've worn, or the ability to create a jersey for an NHL team.
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.....please 
