1) probably not since all of Nightfall's confirmed CE stuff is real life stuff, which they would have to deliver, they may do this, but probably not as when you purchase in store they dont even bother to generate a key for you, just add it to your account.
2) That depends on where you live and if/when they get their stock. If there is an issue like last time they might not get their stock till late and can't dispatch to you. Also if postal services in your area are naff, it may take longer.
I Received my factions CE on release day, but theres no guarantee that it will, but it should, if you know what I mean.
I've ordered mine from Amazon and the dispatch date is the day before Nightfall hits the shops, I paid extra for next day delivery so hopefully it will arrive on time.
Amazon is pretty good generally, if they have to put anything back a few days they do update the page and you should get an E-mail.
The Online store adds stuff DIRECTLY TO YOUR ACCOUNT. Theres no mess with any physical materials or access keys...YOu just put in your Credit or Debit information and you have access to what you bought.
So CE's would have a huge problem here...you'd be spending 20 bucks extra for just the INGAME materials form the CE since they dont mess with any physical stuff liek the poster, DVD, CD, etc.
And Also...CE's are limited edition things, they only make a certain number of them and after awhile they become rare, if they just let you buy it off the store there would be an unlimited number of CE's in circulation for that period of time...