On today's PTR notes Blizzard has revealed that starting with Patch 10.1.5, you will be able to freely trade items and gold directly to any other character in your region!
Players will now be able to trade items and gold directly to characters on other realms in their region. Previously this was limited to things like conjured items or eligible raid/dungeon loot, but all those cross-realm restrictions will now be lifted. Read more on wowhead.com