Are we going to get the explorer pack in the in game mail , or what? Because early access is 1 day away, and I haven't received any email from anyone saying give this code in, etc.......

Or is it automatically going to be in my inventory since I ordered the Imperial Digital Version on the beth site?

The early access code gives you the items. So yes you'll get the horse, roll an Imperial, roll any race any faction, the pets, etc for Early access. If you bought from Beth is all auto added in your account.

We won't get the Explorer Pack before the 4.4.14 sadly. I know, that's dumb because all the Treasure Maps for the starting zone will be almost useless.

Wrong. All the loot will provide usefull crafting mats.