Thinkgeek has released the Frontline Pack for pre-order, and it includes following:
6 set Class Emblem Pins
Tanker and Pilot Emblem Keychain
WWI Dog Tag
Beanie printed with class emblems
And of course, a code for the in-game dog tag. However, note that it says this dog tag is only exclusive for 59 days after launch, so I guess it’ll be made available for everyone later on.
All in all, I think the pack looks all right but may be a bit heavy on the price for its content ($24.99) even though being officially licensed.
Here’s a link if you’d like to check it out: http://www.thinkgeek.com/product/jlvi/?srp=3
Edit: Apparently it does not ship outside US/Canada