If I were you I would not wait for Tizen or take the project seriously. Back when I bought my first netbook around 2009, my expectation was that I would use it to run Moblin, since I had read about the system and seen the demos. My expectation was that it was pretty much going to be the most awesome thing ever, and I thought it was interesting that the project was backed by Intel (now I think that it was stupid). In retrospect, Intel probably saw the project as a cheap way to get people to buy more Atom chips, but had no real interest in actually investing in the software.
Anyway, Moblin actually did make releases, which I eagerly gobbled up and loaded onto my netbook with anticipation. Every release sucked badly; it was just a shitty Linux distro hastily thrown together by a bunch of buffoons that didn't know what they were doing. The project was all hype and no elbow grease; the window manager was cool, but the overall environment was barren. My optimistic self was saying, it's OK, these are just initial releases! They're working hard on it! The project died abruptly, and Intel decided to dump the thing on Nokia, who thought that somehow it was a good idea to just merge the system with Maemo and call it Meego. I thought, "Ah, finally, the project has been rebooted and we'll see some results." I eagerly gobbled up the subsequent Meego releases. It was, in fact, no different Moblin... it has just been rebranded. They did smooth out enough of the bugs to actually make the system usable and implement some internal changes, but ultimately the system was still pitifully stagnant.
Lo and behold, they finally decided to throw in the towel, and one morning I visit Meego's website to check for a new release only to find an announcement that the project was canceled. Meego is no more, but wait! They want all the Moblin/Meego people to go follow Tizen now! It's backed by the Linux Foundation! The Linux Foundation has already proven that they can't develop shit. They're just a marketing organization that knows how to make nice little web pages.
Seeing Meego going and Tizen coming is like listening to the HURD project talking about why it switched from Mach to L4. OK, so you decided to cancel development of an unfinished project and radically redesign it and start over from scratch. We should care why? The people behind Tizen are probably right now flying to a conference to meet with the teams from HURD and Duke Nukem Forever to share development strategies.
The question is, why do we need Tizen? Every description I've read describing what Tizen is supposed to be looks like it was just copied and pasted from Palm press releases when they began developing webOS. webOS is now a mature, complete, functioning system running on big name hardware. Sure, HP royally screwed things up, but my faith is that webOS will live on. In the mean time, Android is pretty much unstoppable. Neither Android nor webOS are as open source to the extent that Tizen would be, which will probably be the one thing that keeps me following Tizen regardless, but I don't have much hope for it.