If you didn't receive the Nokia Developer Newsletter in your email inbox in the last few months, then something has probably gone wrong with your registration (this has been noticed in a few cases since we switched to single-sign on).
The easiest way to enable the newsletter is to go to the bottom of your profile's setting tab, to the section "Sign up to receive latest information". Uncheck both the checkboxes and then press Save. Then re-check the boxes and save again.
That's it - you should receive the newsletter next time it is sent out.