Thank you for contacting Parallels Technical Support.
As I understand, you want to update MAC OSX to the Lion as soon as it releases.
I would like to inform you that Lion is still in beta version.
Parallels Desktop does not support the beta version of Lion officially. It might work with the Parallels Desktop 6.
As soon as Apple announces the official release of Lion, Parallels Desktop will announce the Lion supported build of Parallels Desktop.
When Lion is released to the public we will post and share details about its compatibility with Parallels Desktop for Mac.
We also encourage you to make sure you are running the most current version of Parallels Desktop 6 for Mac with the most recent update.
Check the Parallels Desktop build that you are using.
http://download.parallels.com/desktop/v6/docs/en/Parallels_Desktop_Users_Guide/22961.htm
If you are using any old build then please go to the URL mentioned below and download Parallels Desktop latest build 6.0.12090 and install it.
http://www.parallels.com/products/desktop/download/dr/
Feel free to contact us for any further assistance.
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As of now, I am placing this ticket on Resolved status. This does not mean that the ticket is closed.
If you have any other questions regarding the same then do reply to this mail within the 14 days, we will reopen this ticket for further assistance.
Thank you for choosing Parallels.
Have a great day ahead!
Thanks,
--
Pankaj Verma
Technical Support Engineer
Parallels
Knowledge base:
http://kb.parallels.com