upd #1

• Base damage is now 57.2 ( down from 57.6)
• Base damage now  gets +3.1 per level (down from +3.5 )
• Base mana is now 235 ( down from 270)
• Base mana now gets +35 per level ( down from +45 per level)

• Ragnarok [ R ] - Now divided to a Passive and an Active
• Ragnarok [ R ] - Passive: Olaf gains 10/20/30 Armor and 10/20/30 Magic Resist.
• Ragnarok [ R ] - Active: Olaf removes all disables from himself and becomes immune to them for the next 6 seconds. During this time, Olaf loses the passive portion of Ragnarok and gains 40/60/80 Attack Damage.
• Ragnarok [ R ] - Cost 0/0/0 (Previously 100/75/50 Mana)
• Ragnarok [ R ] - Cooldown changed to 120/100/80 Seconds (from 100/100/100)
• Reckless Swing [ E ] - Now deals 100/145/190/235/280 (+40% Bonus AD) True damage (down from 100/160/220/280/340 true damage)
• Reckless Swing [ E ] - Added to the tooltip: 'This ability's cost is equal to 40 % of the total damage dealt.'
• Reckless Swing [ E ] - Added to the tooltip: 'Basic attacks lower the cooldown of Reckless Swing by 1 second.'
• Reckless Swing [ E ] - Cooldown is now 12/11/10/9/8 Seconds (up from 9/8/7/6/5)
• Undertow [ Q ] -Tooltip now says: 'Olaf throws an axe to a target location, dealing 65/110/155/200/245 (+100% Bonus AD) physical damage to units it passes through and slowing them by 35/40/45/50/55 % for up to 2 seconds.The further the Axe flies, the longer the slow lasts,but it is never less than 1 second.'
• Vicious Strikes [ W ] - Tooltip now says: 'For 6 seconds, Olaf's Attack Speed is increased by 30/45/60/75/90 % and he gains 8/10.5/13/15.5/18 % Lifesteal.During this time,Olaf also receives 1% increased healing from all sources for every 2.5 % of Health he was missing when Vicious Strikes was activated.'
• Vicious Strikes [ W ] - Now costs 35 Mana (changed from 40/45/50/55/60)

upd #2 

Remember - all changes here are compared to his PREVIOUS changes last patch, and are not compared to live. Please see his changes from last pbe patch here.

• Vicious Strikes [ W ] - No longer increases his Attack Speed by 30/45/60/75/90 %
• Vicious Strikes [ W ] - Now increases his Berserker Rage's Attack Speed bonus by 20/40/60/80/100%
• Reckless Swing [ E ] - Now deals 70/115/160/205/250 Damage (down from 100/145/190/235/280)
• Reckless Swing [ E ] - Now scales with 40% Total AD (Changed from 40% Bonus AD)

@ http://www.reignofgaming.net/news/25667-unofficial-pbe-patch-notes-for-9-10-2013-shyvanas

@ http://www.reignofgaming.net/news/25652-unofficial-pbe-changes-for-9-9-new-champion-trades