RVZ

Looks like you guys want to have the cake and eat it too
From what you guys say, C# is moving from a pure classical language to add features of prototypical languages like javascript.

Will you guys also be using JSON style name/value pairs to create heirarchical data structures with the "dynamic" data type?  I am guessing you will allow the developers to also "augment" the "dynamic" data type in a similar fashion.  If you do, how are you going to provide for encapsulation (everything is public access)

The covariance and contravariance stuff is cool.  When I saw the example, I was thinking "duh, but of course"

I like the optional/default parameters and named parameters too.  I have been wanting that for atleast 4 years now

Keep rocking
-Rvz