2006- Work started on the game
2007- No info released
2008- No info released
2009- No info released
2010- Announcement
Look at http://i40.tinypic.com/bj7993.png. Assuming that's what actually happened, then it throws any pattern right out the window because they've already spent ~5 years on it. And to stick with the pattern, they would have to not only announce it before E3 this year, but show it at E3 then release it later this year. Sure, they could easily not follow the pattern, nothing's stopping them. But it seems rather odd that they would wait this long to announce it then. Fallout 3, a game completely different from TES, only took them 2 years work of "Development with no info released." What could be taking them so long? Ok, maybe they want it to be really really good. But then there's the biggest elephant in the room. The quote in the first post in this topic, from Todd Howard himself. Not only did he say they've been making the new game since Fallout 3 was finished, but that the whole time has been spend re-doing their engine. If they've been working on it since 2006, what on earth was he talking about?
It just doesn't add up for me. It could happen, but like I said, I like using facts for my speculation. And all the facts point to 2008 being the starting date. But sure, it could happen. Nobody here is trying to be right, they're only trying to further speculate when this game we want to bad will be coming out.
Also, one has to consider the fact that Pete Hines said that they're working on multiple projects. Who knows, they could have been working on TESV since 2006, and the game that they started working on in 2008 was actually a completely different game. Maybe Fallout 4?
But luckily we can all agree on one thing. Bethesda has to announce it in the summer or else their trademark will expire. That may be the only thing we know for sure.
I see what your saying. What I was suggesting is that they could have been laying the groundwork while their engine was being rebuilt. The devs didn't have anything to do until that part was done. The writing for a TES game can be very time consuming due to the number of quests. There's a lot of things they could have been doing even if the engine wasn't ready.