Okami "2" is a Wii title. Okami, on the PS2, while a critical success failed to meet expectations and Clover Studios, the dev house that made the game, was closed down by Capcom. Clover Studios has essentially reformed into Seeds Inc which then merged with ODD and is now
Platinum Games.
Wasn't that done before it was clear how well the game would sell though?
Anyway, Okami 2 on Wii makes a lot of sense. It was well received by Zelda players critically, after all, so there's a lot of potential for a decent market for them on Wii, and the whole brush thing screams Wii-mote. Should be awesome combo.
Laa-Yosh is right about Killzone and Guerilla. The game hasn't been in the making for that long. They have a huge team now, but they had a lot of trouble getting the team together, partly because Guerilla is based in the Netherlands and to a large extent, Guerilla was already a huge slice of the relatively tiny (though budding) game industry we have. In the end they actively sought people from abroad, and being based in Amsterdam, I suspect they were successful enough (it's a great city and talented games developers could do worse than be there for one or two years), but this all happened in 2006, so I think 2007 was the first full year where they had the complete team working on the game, with also indeed work on the PSP game having been the primary focus before that (which by looked and played great and boded well for the team).
However, unless they hired complete idiots, I do think that the team should be able to get the game out at the planned date this year. You can't wait to long anyway, or your great new technology will be outdated again, and Killzone seems to be at least partly about great technology. They run the risk of being overtaken during development and then thinking ok we need to change or add this, and experience another set-back, but they can't really afford to. I think when we saw then in E3 they were doing pretty well, so I'm thinking the engine will be ok and their asset creation pipeline as a result should be pretty productive now. The major risk factor for not making the deadline would be online play. I expect they will still run a beta, so we can follow progress to some extent. If they don't get a beta around the same time as the Halo 3 beta was last year or if it has major problems, then things will be looking gloomy for the final release date. Also, depending on how closely they're tied in to new PSN / Home functionality, that could affect them also.
However, within the SCE group of software developers server based online play in general seems to be nailed pretty well (ironically my online experiences for multiplayer have been better on PS3 than on 360), so in terms of the basic functionality at least the online implementation shouldn't be too much rocket science.