Well, its available somewhere. I can’t seem to get the link going here in Australia, but Steve Bennett did (see image and tweet below). I’m guessing this is only in certain localities?
Here is a PDF about it:
http://static.autodesk.net/content/dam/autodesk/www/products/autodesk-revit-family/docs/pdf/Revit_RevitLT_online_trial_final.pdf
And some Google search results:
Heads-up:
HUGE! #Revit trial in the cloud!!!*** http://t.co/2v1roCaxVZ***NOTE: Workshared projects are not supported… pic.twitter.com/P1UyeFfdGa
— Steve Bennett (@SteveBennett723) August 14, 2013