From WotC's twitter feed:
Interim solution - if you've already received your second email. Try this link - http://ow.ly/b7Fkc #dndnext
Dear Dungeons & Dragons® Fan,
You are receiving this email because you requested information about the start of the D&D Next Playtest and how to participate. We are pleased to inform you that playtesting for the next iteration of D&D® has begun!
To thank you for your early interest and enthusiasm, we’re giving you a head start on downloading the playtest packet. Later today, we will be making the materials available to all playtesters.
To download your official playtest packet, please click here and follow the instructions provided. You will need to log in with your Wizards account or create one if you do not already have one.
Thank you for your interest in the D&D Next Playtest. We look forward to your participation and feedback.
Happy Adventuring,
Congratulations! You are officially signed up to participate in the D&D Next Playtest. You should receive an email within the next 30-60 minutes with instructions on how to download the playtest materials. If you do not see the email in that timeframe, make sure to check your spam folders in case the instructions were accidentally moved there.
In the meantime, you can talk with other gamers and stay in touch with D&D game designers by joining the official D&D Next group page at http://community.wizards.com/dndnext.
Thank you for your interest in the next iteration of D&D. We look forward to hearing your feedback.
Happy Adventuring!
The D&D Team
From WotC's twitter feed:
Interim solution - if you've already received your second email. Try this link - http://ow.ly/b7Fkc #dndnext
http://wizards.custhelp.com/app/answ.../kw/D&D%20Next
Try that. btw I just downloaded it from the above.
It's in the DND Next General Forum.
edit: I think you have to go through the hoops to wait for that 30-60 minute delayed email in order to use the link.