The ADO.NET vNext Community Technology Preview ('CTP') went live today...Hopefully I can convince Tommy Williams to write up his 'from the trenches' post once he's recovered ;-)
Anyways, on to the LINQs links:
And, of course, you can get a hold of the download itself.
Now, if you aren't familiar with all this ADO.NET vNext business, check out these resources:
MSDN Dev Centers