I got my laptop updated to 8.1 and i found 2 issues so far:
1- my monitor tuns off after 30 minutes when plugged in, but doesn't turn back on. Happened twice and had to force shut down. (laptop wasn't on sleep)
2- keyboard and touchpad "Failed to start" after windows startup, so i entered the password using on-screen keyboard and restarted windows.
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UPDATE!! 24-11-2013
seems that Intel finally solved the issue, released driver 3345.
go to Intel's system detect site and make it detect your system for updates: http://www.intel.com/p/en_US/support/detect
this update has numerous fixes and the most important is: Resolved black screen occurring when resuming from an automatic monitor off scenario.
link to fixes: http://downloadmirror.intel.com/23405/eng/ReleaseNotes_GFX_3345_64.pdf