What does everyone feel about the Next system? I'm loving what they've got so far, but am already craving options.

 I want to take my current 4th ed character and be able to directly transer him over to 5 e Next ruleset..

I want 5th ed and 4th ed monsters options for variety and DM control. I like 4th ed hit points to better allow characters to live longer than 3 levels. 
 Also, feet and squares should both be written down for options of playing with or without a grid. In all editions, the DM stll had to stop to do the math and this puts an uneeded pause into the game.

Make sure the game has accommodation for 2 or more players, to better get friends not familiar with the product more easily involved.

 put character backgrounds and theme challenges into future adventures, to add to combat, puzzles, riddles etc. for more immersion, ... for combat or non combat challenges. The Next edition Background skills and Themes need to be put to viable use, to perpetuate the storytelling and possible overall achievement of said game. The farming, blacksmithing, cow milking, etc. must have a purpose and not just be empty filler.

 And lastly, in real life it's always simplified to a chance of 50/50; you may be a fighter fighting bugbears in a forest, but what are the odds that nature (or the gods)will have a tree branch snap off from bad weather at that time and crack you in the head, killing you or your enemy or both instantly? I'd say about 50/50 .