I wanted to make a poll too, one which includes more factions despite some seeming less viable or whatever. Here goes.

Tau all the way. Give me some battle suits to jump around in. That would be awesome.

Still voting Necrons, although I believe the Imperial Guard will probably win. People seem to love them.

Aren't chaos renegades chaos worshippers that got thrown out?

Sisters of Battle - > IG/Tau - > Necrons -> Dark Eldar

<3

Dark Eldar, no doubt. Maybe Necrons, but they'd need to convince me, their wargear seem pretty limited by class, and they'd be sooo slow...

Dark Eldar, as they would fit in best into the current setting both lorewise and individual unit-wise.

SoB are not that far off though either.
Necrons are a tough call, since they also have the makings of an NPC faction.
Tau and IG are both possibilities too ofc (also Chaos Renegades, nice add to the poll), and probably more likely than the others as well.

Guard.

Every other faction has been pretty much ruined by GW. Tau were always awful.

For the greater Good! What about chaos daemons and adding new sub factions like Alfa legion and Black templars?

They can't add Black Templars.