I don't know what to think and expect...
When I saw the title, I thought he's planning to ride some local and national races for some continental team, but he plans to ride the Tour with Astana... I don't know what's the idea.
To prove he's clean? It won't be a problem - he's not going for a victory.
To draw attention? He can do so on many different ways.
To help Contador? Astana's already very strong.
It would be nice to see Jan, Basso, Vino riding next year's Tour, so we could compare new clean generation with old (now truly old) dirty generation.