This, the concept of a staggered EGA is good and i see the reasoning behind it, though i believe it wasn't executed as good as it could have been.

15th will be in today according to Rockjaw

You dont need the link just login and play

This.

I haven't had much play time (Just around 10h or so during Beta Stress Test) but the game is alot like a Single Player game with other people. The dialog options make it feel more like a Single Play RPG (Like your playing Dragon Age or Mass Effect). Both games i got really dragged into the storyline of and played days on end. I think SWTOR might be similar Bioware has done something different whilst still keeping MMO Aspects that work. I think its a great combination but only time will tell.

You redeemed a Pre-Order code not the Main Product code. The code the website is refering to is the one you will be emailed Tomorrow (16th) from Origin

You dont need to put in a code. Just login once you have the email. The steps you are shown is for your actual Product code (which you probably dont have yet)

You will get in early if you get in any point before the 20th. At the current rate of waves the chances are all of December Pre-Orders will be playing by tomorrow evening