Looks like Tiamat and either Pelor or Ehlonna are on the way out this time. From comments made this thread I'm guessing that Nerul and Gruumsh don't have long to last after these others are gone. This leaves: Boccob, Erythul, Fharlanghn, Heironeous, Hextor, Kord, Moradin, Obad-Hai, Olidamarra, and Wee Jas. But I note that of these, those with the least votes at present are: Hextor, Heironeous, Boccob, Moradin, and Obad-Hai - suggesting that these will be amongst the last to go.
These deities are interesting in their own ways. Obad-Hai is a virtually perfect neutral nature deity. Moradin is the only racial deity remaining (dwarves). Boccob is the necessary deity of magic - and in some people's view one of the better ones, due to his neutrality. Hextor and Heironeous have a long and well known conflict and in some respects represent the opposite aspects of war (chaotic slaughter, organized strategy - rather akin to the difference between Ares and Athena, actually).
Of those that almost make the grade, we have: Erythul, Fharlanghn, Kord, Olidamarra, and Wee Jas - deities of malace, travel, strength, trickery, and death / magic.
It will be interesting to see how the current seeming pattern / balance changes over the next few polls. I image that once Tiamat, Pelor, Ehlonna, Nerul, and Gruumsh are out of the way the votes will fall more heavily upon the lower tiers - likely changing the balance notably in the process.