Really ? leaks like what ? In June , we already know everything about WP8 except few features.
Did you see Sony how they made a developer edition for their Xperia and selling them ? or HTC One dev edition ? Apple also hands developer edition devices to companies like EA and other companies to make apps for devices.
Did u see EA games giving demo of Real Racing 3 on iPhone 5 event ? It ran on full resolution and taking advantage of A6 processor graphics.Did they make that app in 5 minutes ? No ofcourse not.
They made the game most probably using a prototype or testing device sent by apple to EA division and Apple also did same back in 2008 when they unveiled iOS 2.0 SDK and appstore.They already contacted lots of devs before keynote and demoed bunch of apps during the event.This happend before even appstore came into existence and iOS 2.0 features were unveiled.
Its not hard , Is it ?
As an end user , People keep waiting for apps.No company must ever release SDK and consumer devices at the same time or within one month time frame.Giving SDK earlier would have made devs to release all their apps right when devices started flooding the market.
HTC one is running an already outdate os at it's launch. Making dev devices for it is no problem. Sonya the same. They run an existing OS or older than the cutting edge os and they cant leak anything. WP8 phones were officially announced in the end of October so no dev devices in the begging of the summer.
iOS situation is again misleading. iOS 2.0 introduced app store so it needed apps. So yeah they gave the sdk earlier. That was the case for wp7 devices and they did the same back then.
games for iphone 5 demoed are again misleading. The game is made for ios(all iphone models) so presenting it on iphone 5 was made in less than a week because the engine was already there. The models were there, textures were there. They had an working game already made for previous devices. They just recompiled they assets to showcase the game on a more powerful Soc.
As stated new and powerful emulator based on better emulating techniques requirering the newest desktop os. So you can't have SDK(emulator is there) until you have windows 8. Windows 8 launches, windows phone 8 launches, SDK launches. That is completely normal.
As end user people should comprehend they have their own fault. Fault of understanding making new apps takes time fault to understand that they might not see the apps that are on competing ecosystems. Fault of understanding that they must prove demand for apps with their wallets not just by words. If statistics show small number of devices and low desire to buy apps who do you think will invest money to make apps? Users want the apps that are free and belong to various service providers. Well it's easy making apps has costs. Providing those apps for free means you need to be sure there are enough of your costumers there to make sense. For the moment there are not.
So it's not because of the SDK you don't see apps flooding. It's part of the problem but still not the main one. No one was stopping anyone to make wp7 apps full knowingly that they will run on wp8 devices. They could have flooded the devices and be update to the wp8 versions after wp8 launched.
The only case were this does not apply are games but for games but even there people knew enough to start build games earlier if they wanted. And for games you do need access to retail devices from various OEMs no matter how good an emulator is.
So you still not made a case for the necessity of faster updates of the SDK or how the SDK features affects end users.
Nope it doesn't , Amount of tiles which are placed is also same which is around 7.5 small tiles
Apart from browser , there is no place but again you have to zoom for desktop sites on any device.
EDIT : There are accessability settings to adjust font/text and they can even implement it for UI elements , right ?
Since there are no icons on wp8 you don't get a new row of icons like on ios so number of tiles on the start screen means nothing. And you cant expect the number of tile to differ for having a taller resolution.
Of course there is like on the iphone. Look for apps with lists and see new elements in the list on the htc 8x as opposed to the 820.
Depending on how someone choose to make an app. If it is graphically intensive you get nothing by scaling font and it may wrap. So font size was not made as a silver bullet. It helps but not enough. And definitely not in case of touch targets(the elements that have touch functionality).