My thoughts:
Street Fighting: Gets my first vote. Steer clear of anything that resembles martial arts though. This should be a brutal looking powerset, as opposed to the finesse shown by MA. Should work fine with Tankers, Scrappers, Brutes and Stalkers too.
Electric Hammer: Isnt there already an Electric Melee for Brutes? {Why havent more of the Brute primaries not been implimented for Tankers secondaries?} If this power was just Sledgehammer (as mentioned above) I'd like it more. Even then, what would seperate it from War Mace? Doesnt quite get my vote, but it sounds ok with some work.
Energy Blade: I'll jump on the Jedi wagon here. I'm opposed to this power. There is enough blade weapons in the game as it is. Stop the madness. Bad idea.
Psionic Weapons: At first I was unsure, but it brings some interesting possiblities to the Tanks. Most are not very strong against psionics, yet here is a set that is all psionic. It sounds more scrapper/stalker to me. I'd like to see more, but it still doesnt get my vote.
Dual Blades: I guess you could do this one. It is the logical next step power from all the other weapon powers. However, it doesnt seem interesting... just graphically twice what they are. No vote.
Ball and Chain: Like the Sledgehammer and War Mace, I am not sure how this weapon would differ. I love this idea more than either Sledgehammer or War Mace though. I just cant vote for it though unless I see more.
Shield Fighting: About damn time. I saw this and about collapsed outta my chair. I'd vote multiple times for this one if only I could. And I could, I'm just lazy.
I also saw a SPEAR suggestion.
Spear: This would really be the next best weapon power. We already have slashing and bashing weapons, why not something that pokes? Historically spears are vital to cultures across the world, and the possibilities for Spear-Heroes are about limitless. I'd make one.
That's my opinions. Seem similiar to some of the others here.