Step 1: Remove kewl powerz. Replace with abilities that grow with the character and are not plug-n-play.
Step 2; Make classes feel distinctly different
Step 3: The return of spells that actually DO something
Step 4: Abolish Minions
Step 5: Get rid of the rogue. It becomes a thief, lack of combative power
will be made up for in other parts of the game.
Step 6: The Re-inclusion of non-combat play
Step 7: As per 3 with regard to magic items.
Step 8: Effects will exist that can possibly remove you from combat longer than 1 round. It will no longer take 2 hours to chew through 8 kobolds so you won't be stuck THAT long.
Thats a start. What next?
When can I buy this?