[Plugin: Jetpack by WordPress.com] why so many updates ?

And i dont get it whats new in the update ?! can anyone tell me whats new in the update ?

Can i limit the amount of content gets posted to my subscribers ? because i dont want all post to be emailed there will be no reason for my visitor to come back if he gets the whole post in email !

I suggested that before and still no option for that

thank you

http://ww.wp.xz.cn/extend/plugins/jetpack/