TheDarkTwins: It's understandable to be skeptical, but I just was at league yesterday and was playing against Luxape, and dominated both games I played against him. He's a good player, a good list, and decent draws, but he just couldn't overcome my constant power lock and Azelf really hurt him too. Now, my list focuses solely on Power lock and Palkia, I don't play Dialga or Luxray or anything. Under a power lock and Azelf lock it's just too hard for Luxape to setup multiple threats. And when they do setup a threat, Croak G usually comes back for the KO. And, I've tested against Luxape before and never lost. Again, Palkia is an extremely difficult deck to play though, so experience contributes largely to the success of the deck.
I have been playing this deck ever since PT came out, and I don't mean to sound arrogant, but I do understand the deck very well, and for that reason Luxape is an easy match for me. Now, if u are playing someone who isn't on top of their game and very experienced then you could very well find the matchup to be fairly even. I'm just speaking from my own experiences, if that even means anything.
EDIT: Back on topic now, Gengar is way too easy play around now. It may do well in juniors and seniors because it does take some skill to play around regardless of what others might say, but a Master who has qualified for worlds should be able to handle Gengar with somewhat ease, as long as they don't hit every Fainting Spell flip. Beedrill will see play as it is fast, consistent, hits hard, and recovers easily. Champ may see play also just because SP decks are so popular. I don't think it will do that well but it's still a slight contender. The right Kingdra build can surprise some people and do pretty well in the right hands. Luxape is so over hyped, but it's no doubt a good deck that will see pretty good play. Plakia lock will see some play, and honestly doesn't have any bad matchups, but it takes a lot of practice and skill to be effective, SO the success and popularity of it won't really be known until that day. Palkia varients will be popular though, Palkia/Dialga, Palkia/Luxray, Palkia/Dialga/Luxray, they will all be played and in full force, expect quite a few in the top 32. Hmmm, anything I missed? Oh, Plox! Plox is good, but struggles against Palkia Lock like most decks. Most people are fed up with Plox, but I believe it's the best setup deck out there right now, but we got so much of it last format that I think many people are too scared to play it now. Rogue decks prolly won't be that popular, but random SP decks and Shuppet/Starmie donk may be seen here and there.