More or less purely subjective. Briefly describe your ideal version of D&DN. Feel free to include any absolute deal breakers..
Then in plan B describe what you will accept and by accept I mean what you will actually spend money on if you do not get your ideal version of D&D.
Plan A. My Ideal.
A simplified d20 game that is a hybrid of Star Wars Saga and parts of 3.5 and 4th ed. No dead levels feats and talents unlock powers and abilities for some classes, spellcasters are vancian with at wills.
The deal breakers.
A simpified incomplete system- not going to pay money to add modularity later, 4th ed reprint, 1st ed reprint- by reprint I mean a game very similar to those ediitons not 100% identical.
What I would accept.
A cleaned up second ed no feats or skills, d20 based higher is always better (saves, attacks, etc), no level limits and no racial restrictions.
Something new but it has to be better than SWSE, Pathfinder and 4th ed mechanically and it has to have some amount of complexity to it even if it is at 2nd ed levels as opposed to 3rd and 4th ed.
A fixed 3.5.
A 2nd and 4th ed hybrid of some sort (AEDU fighters in a d20 based 2nd ed world with priest spheres and vancian wizards)
Whatever they do though it has to feel like D&D so alignments, the great wheel, Vecna, Kas, Grazzt, Orcus, Demogorgon, Asmodeus, Mordenkainen spells etc are important to me. The game also has to be fun most importantly so I do not care to much about the mechanics as long as we don't have CoDzilla or 4th eds class/role structure.
As to modularity they can do anything they like I really do not care. No alignments, 4th ed PoL setting, AEDU class book, gunpowder, Ravenloft, laser beams, space ships, ninjas, androids, gonzo races, animie powers/classes knock yourselves out as I don't have to buy it if I don't like it.
Fear is the Mind Killer