Isengard
No Hobbits Allowed
As far I know, there will be a physical copy after launch that you'd have to pick up from the retailer and no, there isn't any additional costs involved that I'm aware of.
General note: There seems to be a bit of confusion as to when the pre-purchase programme stops. We don't have an end date for this yet - official word from ArenaNet is that the 10th (today) is the start of the pre-purchase programme (i.e. the 10th isn't the one and only date you can pre-purchase). I don't know what's going on in the back-channels (Retailers -> Megarom -> NCSoft etc.) but I highly doubt that South African retailers will just stop acquiring pre-purchase keys after today.
EDIT: Soz, I forgot to say that the CE (Collector's Edtion) of the game is very much limited in terms of supply, so if you plan on purchasing it, today will probably be a good day to do that. According to Martin Kerstein (head CM at ArenaNet), they only plan on doing a limited print run for GW2 CE.
Also, for those thinking they'll miss out on the "Deluxe" version of the game (with all the in-game goodies), Aidan at ArenaNet (one of the European CM's) says the following:
Upgrading to Digital Deluxe will probably cost like 20 Euros and for a few digital items it's definitely not worth it.