I love everything about my Jasjam, so hold me back when something like WM6 comes out.  Questions as follow..

Whats the difference between WM5 and WM6  ?

Do I need it....(ohhh come on...what I really mean is can I have it )  ?

I guess operating systems on a mobile are different from on my PC...after doing a quick search online
I don't see that it is available, like vista, to purchase and upgrade my current mobiles operating system, (WM5).

Whats the guff...?