Releasing any 4.5e, let alone releasing one right now, would be a monumental mistake.
WotC should try really hard to find some way to get through two more years with 4e/Essentials, and then think about releasing 5e.
Specifying it would negate the intend of my poll. I want to see how purchases are affected by the naming of the products. Would just the name put you off or would you give the product a fair chance, despite of the name? Please answer honestly.
Just for @Morrus to decide, just let's say they had 'Essentials' called '4.5'.
I still see Essentials as 4.5E, particularly in terms of the revisions to monsters.
4e needs cleanup. Major revisions via errata (like to save penalties, flying, mounts, etc.). Obsolete feats. Feat taxes. Math fix feats. New (better) way they do things now the product is more mature. Vast amounts of bloat. 3000 FEATS. People are talking about "fixing the warlock".

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.