This is fairly troubling, NXT already has an amazing market cap for it's age alongside the fact that it hasn't even been released yet.
When does three to six months become a year, and a year become two?
If it the source code isn't released on Jan 3, as originally indicated, the value will likely plummet until it is worth nothing. A new coin will come out (based on NXT, people are smart, it can't be that hard to figure out how NXT works) and will be made open source.
My advice, get the source code out at soon as humanly possible before NXT is worth nothing. Sure, clones will be created, but they will never take off. Look at all of the worthless coins on Cryptsy and compare those to BTC.