As with all things in MS's current phone division it comes down to three main things:
- Will it work as advertised?
- Will it even be advertised well?
- Will it have enough features to be competitive?
- BONUS will it come out in a time that it still matters?
Those are the main things. MS has a great product here, but they are moving rather slowly compared to their main competitors. Regardless of what many try to say, what's keeping MS afloat are Nokia's ferocity in attack and advertising and a strong group of small users.
Otherwise, as a NL920 user, I can say that I always get the feeling they're about 18 months behind to be competitive. That is, when GDDR3 comes out, I'm sure fans will laud it, but it won't make the bang I feel it should. Why? Lost in the current standing just implementing things that were worth noting a year before, but are so expected now potential users may just say "wait, it's just getting a feature like this?"
So I'll have high hopes for Cortana actually existing, and even existing in a way we are hoping (I always thought it'd be a no brainer to have our xbox Avatars be our PA's since every device has one, they'd pop up reminding us and everything, while making things personal). But if it's still not on a basic level of interface as Google Now or Siri, then people will be feeling kinda sorta let down. So I'll hold my hopes down a bit for now.
MS has the opportunity to do these awesome implementations... I really ant them to deliver...