From 7:00 p.m. to 10:00 p.m. EDT on Wednesday, July 18, 2012, help us push the limits of LotRO! Get your first look at Rohan! Cross the Great River from Parth Celebrant and follow the road south through the Wold to the city of Langhold. Your first quest will be available in this city. Spend a couple hours exploring LotRO's newest regions, check out the new quests, admire the great scenery and battle your way through its newest creatures!Riders of Rohan is releasing on September 5th. Massively recently got hands-on time with mounted combat in the expansion and was quite impressed!
From 7:00 p.m. to 9:00 p.m. on Friday, July 20, 2012, help us push the limits of LotRO! Get your first look at Mounted Combat! Go to Elthengels in the Norcrofts and prepare to fight from horseback in the open plains of Eastern Rohan!
[Update: As A Casual Stroll to Mordor and Sapience on the forums rightly clarify, this beta is under a strict NDA. Please obey it, here and elsewhere!]
[Thanks to Ron for the tip!]