A lot of people are giving there opinions, I'll throw in my 2 cents.
Overall, decent concept, that breathes a little more "newness" into the OS feel. But in the end IMO it ultimately only makes the OS more complicated, require more presses to get where you want, and reduces usability.
Firstly, I really like the idea of having the weather widget (optionally) on the lock screen. I would like for Apple to open up it's widget API to developers to create their own widgets. Then allow the user to be able to select which widgets (maybe with a 2/3 max) are displayed on the lockscreen.
Unfortunately, that's ultimately the only thing I truely like about your design.
Do you really think that a single weather widget is more important the the THIRTEEN app slots that you lose as a result of this design(included the slot taken by launchpad)? And what does it really add? There is already the weather widget on the lockscreen per your design, plus the weather widget is already a single swipe away from any screen on the OS. Sure you can argue that in iOS6 you it could be opened up to any 3rd party widgets, and you could fit up to 3 widgets in that space. That would be a valid point, but I still don't personally see any 3 widgets being more important that 13 apps for my needs. I understand that different peoples cases vary, but I just don't see Apple throwing widgets down our throats quite so much. Especially when the money has been in the apps.
Also, in your concept, launchpad simply becomes a giant folder that you can put tons of apps in. So not only is it an extra touch to access, but it provides more difficultly in move apps from homescreen to launchpad and vice versa. Another terrible thing is that when you are in launchpad you lose your dock! And is there meant to be multiple pages on your homescreen? Because that seems like a giant clusterduck to have multiple pages on your homescreen, then multiple pages in your launchpad. The whole thing just takes away from the ease and simplicity that I love about iOS.
You also have to think about widget scalability. Meaning, if Apple allows more 3rd party widgets where will they all reside in your scheme? You could fit up to 3 on your homescreen, but that's about it. Can they scroll left and right? Seems like that could become a bit confusing also. Would you have to use a new location altogether? If so, I really don't see the point of having this location in the first place.
In that regard, If Apple adds 3rd party widgets in iOS6, I can see 3 potential locations they would reside. To the left of your home screen (the search screen). In notification center. And in the multitasking tray. I'll step through each of them for usability (this is a bit of a sidenote/creative thought that I am constructing as I write this)
Search screen: This would be right in line with OS X Lion, so seems like a real posibility. Of course in this scenario, I'd imagine that search would be moved somewhere else (notification center?). This screen would allow for unlimited (ok Apple would probably limit it. So lets say 5-10) virtical scrolling of widgets. Instead of tap to go to app (as in current widgets), a tap would simply expand to more info. Imagine a twitter widget showing the last 2 tweets, but a tap expanded it to 10. An additional tap would close it. The widget bar would contain the app icon on the left side (like current notifications). A tap here (in expanded or closed state) would actually open the full app. To return to the homescreen simply hit the home button or swipe to the left, just as is currently the case with the search screen.
Notification center: This is where Apple already keeps it's two widgets, so maybe this would be the more appropriate location for all the widgets. But is this location truely scalable? Throwing 5-10 widgets in here would completely hide your notifications. Thus, if this were to occur, Apple would need to change the location on your notifications. But I don't see Apple doing that. Therefore, I don't think this would happen.
Multitasking tray/recently used bar: One thing that has always bugged me about this is that it uses less than 1/5th of your screen, but the rest of the screen isn't used for jack squat. So in iOS6 the rest of the screen could be used for widgets. I would imagine all the same functionality as I described above for the search screen. An added perk is that this screen would be available from anywhere in the OS. You can be in your fb app, quickly check your twitter widget, then go straight back to your fb app. ( Remember, to access the search screen you need to be on your springboard AND on the first page. That seems a bit cumbersome to me.) The disadvantage of this method is Apple could see it as being a bit cluttered and disjointed. There is a bit of disharmony in combining these two functions. Also, you would lose the ability to tap virtually anywhere on the screen to return. You would need to use the home button again (a minor thing).
Overall, after careful thought I believe the must functional location for widgets would be above the multi tray, although I honestly think it's more likely for apple to put it in the search screen location.
Sorry for the long post.
