Might seem obvious, but make sure you wear no Juve colours or seem anything other than a Chelsea fan in their section. They have thrown people out within minutes for that in the past. (sure you would have thought about this anyway).
No more news on tickets? I am still keen to go.
If I lived in London, I would definitely get myself down to where the Juve fans are and ask for a ticket. You never know someone's friend might not have been able to go and there is a ticket going. Always worth a go.