When I downloaded the magento 2 zip files from the download page (with/without sample data) I got stuck at the 90% during installation. It was throwing a error in the log screen below as “sample data missing blaha blaha..”.
I found that in [magento path]/app/ I could not see the whole /code folder. Its missing !!
Then I did git clone
git clone https://github.com/magento/magento2.git
and did “composer install” and saw the folder code in app. But the 90% stuck during installation.
On christmas evening I made a “git pull” and saw a list of new and updated files. !! wow it's a great news that the team was working during christmas. 
After the update I could see the installation gets completed. But when I run [site path]/index.php I could not see any CSS/Js getting loaded. The path for css/js files are
[magento path]/pub/static/*
Which is still empty.
And I could also not able to open admin login screen with [magento path]/admin and [magento path]/admin/index.php for that I get 404.
I think it just some missing files. Hope the team could address the missing files.
