there's flavor text for the new beastlords that reveals what their warders will be
Wood Elf Beastlord
"Nature itself rises up against you, abomination. You cannot win!"
All Feir`Dal revere nature to some extent, but only the most devoted receive the great gift of Tunare: a personal treant protector. Alongside their blessed companion, Wood Elf Beastlords fight to protect nature everywhere, and punish any who seek to upset its balance. The natural warder is eager to gain vengeance for the atrocities it saw and suffered for thousands of years in its helpless form.
VS
Gnome Beastlord
"Engineers' Log, Day 33: Add more grease to saw blade. Replace lamp with plunger."
There's no higher sign of ingenuity in a gnomish community than constructing a mechagnome to do all of life's boring work for you. The finest tinkerers find a way to merge warrior, butler, and laborer into a single hardy creation to accompany them on their adventurers. Two gnomes are better than one, especially when one is made of metal and stuffed with deadly weapons!