Quote from Akatsukik14: Go
Seems like the Spectres are quickly trying to infiltrate the base and find Kerrigan (Obvious) The Spectres run through the door though, and seal it so that Raynor can't get inside (So this means that the Spectres, and probably Nova as well, are not allied with Raynor and this is obviously a chaotic race to reach Kerrigan) I'm pretty sure Tosh is dead, and stays dead, so the Spectres have no leader and therefore maybe Nova steps up to lead them. (Ghosts pretty kin-related to Spectres)
Seems that Nova is planning something involving Kerrigan, or simply wants to eliminate her because maybe.... she never lost her powers? Raynor is intent to stop Nova, and just sorta bursts through the chaos.
Obviously Kerrigan still has her psychic powers, due to the cans floating around. Maybe she uses her powers to regain her zerg allies although its kinda unlikely (Tychus Overmind anyone? :D)
If you choose to help Nova, she kills Tosh, and as for Nova leading the spectres, wasnt she the one who was imprisonning them in the first place?