Most of the Harry Potter RPers I know had beta access to Pottermore and forgot about it in the eternal wait for the next book and haven't checked back in a while.
If you didn't know, Slytherins have early access to the first four chapters of CoS as of this morning. There's some new content about wizards vs. technology and the Malfoy family history that may be of interest. Further chapters are forthcoming, but we don't know when they'll be available to explore.
If you aren't a Slytherin, the content is available tomorrow, 24 hours after the Slytherin head start. Any accounts made/sorted into Slytherin after the House Cup ended (5th July) will not have early access privileges (to discourage puppet/multiple accounts).