A couple things with Yordles Lore needs to be addressed regarding what they are.
Earlier this year Riot updated Yordles lore. Saying that they are spirits that take on various shapes given enough time in a certain environment etc. This lore change feels too much like the Vastaya who already do vary greatly.
The reason this might annoy fans of the Yordles in the future is because when Riot finally does come out with a new Yordle. Is it even going to be what we think of as a Yordle? Teemo, Kled, Poppy, Tristana, Or is it going to be some random small animal like creature.
I think Variety in the Yordles is good but getting too wild with their physical race isn't faithful to the community that appreciates them. The Glamour and Physical changes should be toned back a little.