I honestly believe that Night Elf Paladins will be thing at some point since they actually had a night elf become a paladin.
Unlocking and completing the secret mission in the Blood Elf campaign does grant the use of a Pandaren Brewmaster in the next mission, which is where you fight a tug of war for Illidan’s cage. However the Pandaren is just there as an extra hero for the fight. He has no unique dialogue.