I don't think email or email clients are in urgent need of some major 'fixing', but if we really have to fix it, there are a couple of things we should focus on first.
Contrary to many geeks' opinions, I'm not really sold on the idea of a 7" iPad — or a 7" tablet in general.
The 'exciting news' — at least for its developers — is that Sparrow has been acquired by Google. To me, it's yet another proof of the crushing power of money.
I think that Twitter could implement some form of premium account following the example of services like LiveJournal and Flickr, making both free users and premium users happy enough about their choice.