http://www.reddit.com/r/Warframe/comments/227s2d/livestream_26_recap_and_discussion/So Melee 2.0 is coming next week, the devs showed a lot of teasing about the new system and it's freaking amazing.
Charge attack spam is taken out of the game, the game will have a combo system, and a hit multiplier counter that you can maintain, and the more numbers are there, you'll deal a ton more damage. This is how melee will scale into the lategame, it's really effective!
Also there'll be a channeling system where you can channel your warframe's energy into your melee weapon, very fancy, this is all somewhat DmC-esque. But great! The combo system will be accessible via 'stance cards' that you can put on your melee weapon. THese are little mod cards that you can collect and change.
Melee weapons are getting major buffs, you will be able to equip your melee weapon in your hand, blocking is actually working like in jedi knight games with the lightsabers.
I'm hyped like crazy. My melee combat oriented friends, you want to try this out when U13 drops!