Yes, it is! I just installed the iOS7 beta2 on my iphone 4s. It performs well on 4s. Actually, you can even install iOS7 on iphone4 and even 3GS. I heard the iOS7 is slow and stuck on iphone4 or earlier iphone edition. But it definitely works fine on 4s!
yes
some time in june
im not sure but i think only iphones and ipod touch 5th generation can get the ios7 update but im not sure.
Nope. Just the 5th Generation.
You cannot change a computer into a phone
iOS7 automatically shows you how much battery you have left. If you don't have iOS7 then activate VoiceOver and tap on the battery image on your screen. It will read aloud how much battery you have left.
Yes it is out but only for the ipod touch 5th gen no other type of ipod.
iphones do it is under settings and general (except from ios6 and ios7)
Go into the Settings app>General>Software Update>Download and Install.
No. Cydia tweaks is fully updated for the ios 7 for apple.
depends on you either iOS7 which is apple or Andriod OS which is android