I hope the developers put alot of time and resources into developing the professions for ESO. Not only does a profession help earn a living, but it serves as a means of identity for your character and helps drive a successful MMO economy. Here are some professions we will hopefully see:
Herbalist: Harvest plants from resource nodes. This profession supports the Alchemist, Bard, and Scholar. No special tools.
Hunter: Hunt animals to gather their meats and hides. This profession supports the Chef and Leatherworker. Requires Hunting Knife.
Forester: Gather wood from the forest. This profession supports the Bowyer and Engineer. Requires Logging Axe.
Miner: Miners gather ore and gems from resource nodes. This profession supports the Armorer, Weaponsmith and Jeweler. Requires Mining Pick.
Alchemist: Makes potions and poisons (various plants from Herbalist).
Bard: Winemaking (grapes from Herbalist). Play musical instruments (flute, lute) in a local tavern for some coin.
Scholar: Collects fragments of lost lore. In doing so, they can create powerful scrolls (dye from Herbalist).
Chef: Cook mouth watering foods (meats from Hunter).
Leatherworker: Makes leather and studded armor from animal hides (hides from Hunter).
Bowyer: Makes bows, arrows, crossbows, and bolts (wood from Forester).
Engineer: Upgrade and repair siege weapons on the battlefield (wood from Forester).
Armorer: Makes chainmail, plate armor, shields, gauntlets, helmets, horse armor and can repair (ore from Miner).
Weaponsmith: Makes (1h/2h) weaponry, such as axes, daggers, maces, and swords (ore from Miner).
Jeweler: Make rings, pendants, medallions, bracelets, and amulets (gems from Miner).
Tailor: Makes cloth armor, such as cloaks, hoods, boots, hats, backpacks, and horse saddle bags.
Enchanter: Places permanent magical effects on items.
I hope the developers make it so your character can only master one or two crafting professions (novice in all other crafting), as this will add character diversity and customization to the game. However, I think you should be able to master all gathering professions. I also hope the developers add rare recipes for all crafting professions to create a successful economy. Above all, the crafting system has to be enjoyable as this will keep people around for years to come. Thoughts/Opinions?