The Twitter Wingman

According to Wired’s Danny Dumas and Steven Leckart, Twitter is introducing the Wingman, a handheld, pager-like device for all things Twitter on the go.

Very cute! But who'd want to carry an extra piece of gadget on top of mobile phone and ipod and a camera... on the go? I wouldn't - my bag is the size of an A16 size notebook and i choose to have my phone every time. Why not simply a mobile app - esp. with 3G coming soon to China and 4G the rest of the world. Question is, what are the tech constraints for such app?

ps - my twitter id: J4NELOU and thanks for following in advance.