Well actually with orks it's a lot more likely then any other race. Squigs are in every part of Ork life. There's hair squigs, attack squigs, refreshing beverage squigs, oil squigs, 'dat one squig wot doz da thing, they permeate everything. So, maybe?
I could go for a Servo Skull or a Cherub flying around with my Codex Astartes and Purity Seals' display.
If there is going to be squigs, servators or minor chaos demons (also have no idea what eldar would get), id rather see it as a MOBA element like in TitanFall. Actualy, that may be kick ass. It helps TitanFall populate small matches to make them feel larger, and they could defend forts until the controlling players notice its under attack. Agreed, i could see techmarines getting a servator, but the newsletter made it sound to me like a more general add on any player could take.