Umm no IG bombs not in lore. Bomb SQUIGS are and are the orkiest thing since sliced DAKKA. I would also like attack SQUIGS. They might just be near you and attack enemies in melee range but a draw back may be that it can get shot and die and they may bite you and hang on immobilizing and doing damage until you get them off. Also bomb SQUIGS May or may not run back into you and blow you up and anyone around you making it dangerous to bring but also very effective.
come to think of it, they could make it like a sport in the game. Like a Holiday weekend event like dodge the bug, have a hundred members from each faction in a closed setting and the last one standing can win a item or a advantage for the next campaign.
Will there be a squigs? Sure, the emepror will be, as example I wanna see squigs, and not only as a npc) As a "weapon" or "unit" it will be fun)
I was looking around on Devainart and i managed to find a pic of a few squig variants/skins the orks could have if squigs actually do manage to get some use in EC: Attack Squig Armored Version: artist's page: http://rayph.deviantart.com/
Thanks. He's got some neat stuff on dark eldar, too: Kinda a LoL art style. People would probably flip if it was implemented in a game but it's fun to see how the different units look in it.