The best way to upgrade from SL to Lion

Hi,
I’m currently running SL and its actually running verysmooth and I was wondering if I could just upgrade to Lion without actuallywiping my entire local HD, is this a good choice or its always better to do afresh reinstall?
What would be the best way to upgrade to Lion?
Any idea when is the release date?
Thanks

No details have been released, and anyone who knows is not allowed to say any more.
Upgrading has never required erasing.  A few people (perhaps out of habit from using Windoze) do it, but many long-time, experienced users, don't.
Let Apple tell you about the release:  http://www.apple.com/macosx/notify-me/

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