Taken from Runescape.com

RS2 is very nearly complete now. So as the final test before we go for the full launch we've opened it to free users as well as members for one big final test!
This means all the free users who have been waiting to try out RS2 finally can. Just two important thing to remember.

1) The beta is played with a test account, which is a copy of your RS1 account. Nothing you do on the beta will affect your main character in any way. Everything you do on the beta will be forgotten when the beta ends, so bear mind any items or levels you gain here are non permenant.

2) If you are playing the beta with a brand new account you just created, you MUST log it into RS1 at least once, before it will let you use it in RS2. Of course there is no need to create a new account anyway, as you can use your normal character safely. Obviously once we go to the full real launch this requirement will go away.

Fixed: There was an area in the deep wilderness which didn't count as the wilderness
Fixed: Unlocked tunes on the music player were relocking themselves
Fixed: You could walk out into mid air from the tree gnome stronghold
Fixed: Some fishing spots got stuck where you couldn't fish them on Karamja
Fixed: You got poisoned opening the sinister key chest whether you drank a poison antidote beforehand or not
Fixed: Monk's of Zamorak wouldn't stop you getting the wine of Zamorak
Fixed: It was possible to get stuck on the trawler
Fixed: It was possible to repeatedly do the shield of Arrav quest.
Fixed: It was possible to repeatedly finish the waterfall quest