Information is available on the upgrade at
According to Apple, there are a number of highlights
in the 5.0.1 update. It fixes bugs affecting battery life, adds
Multitasking Gestures for the original iPad, resolves bugs with
Documents in the Cloud, and improves voice recognition for Australian
users using dictation.
However, one important element not getting the necessary attention is that the update also fixes a number of security flaws,
including a remote code execution (RCE) vulnerability involving font
handling. RCE means that a cybercriminal might be able to trick your
device into running software without asking you, even if you're just
browsing the internet.
It is suggested that the update be done by going to Settings-Software Update.