What would you like for ME4?
I would like it to be in further future like 50 years after Mass Effect 3, so you could have some of the old Crewmembers like Liara, Wrex and Grunt but still have a fresh start. And it would be cool to see some influence from your earlier decisions like the Krogan or Quarian/Geth decision. The most obvious things are a great gameplay and Story but Bioware has proven that they can handle that. I just hope it won´t be a MMORPG. And alltough I was dissapointed by the ending of ME3 i would preorder ME4 immediatly.
And I hope there will be some DLC´s like the Lair of the shadow broker and Overlord for ME3.