Is the new IPhone update worth it?

I have an iPod4 and an IPhone and I think I'm going to update my iPod but not my phone(it doesn't have enough room).So my question is, is it worth it? Someone told me it will add Siri to your ipod… That's not true, right? And someone also told me that it will erase all your pics and stuff. Will that happen? What other features does it have and do you think I should update?

Yes, it will erase everything, but if you have everything in iTunes then you should be fine.

It, unfortunately, won't add Siri to your iPod.
It'll erase everything on your iPod, but if you've backed it up through iTunes, you can put everything back on.
Here are some of the features:
http://www.apple.com/...e.com/ios/