Hi diogowernik,
1/ Premium membership gives you full access to Octopoos' store during one year. After expiration you are still able to use all the products you have downloaded on unlimited domains thanks to lifetime license, but you won't have access to downloads anymore.
BUT if you have already paid for Exporter Add-on and Masonry Template as "single-purchase" (or any other product), you will still be able to download lifetime updates for these products.. even after your membership expiration.
2/ Private forums are already available. You get access to these forums, after your subscription.
3/ During the week, we are going to open Professional Support Packs (1, 5, 10, 20, 40 hours..)
With this professional support, you'll be able to get help for your projects, about anything related with Joomla! & SEBLOD: development, templating, web mastering.. via email, Hangout or Skype, Webex..
With the Premium Membership, you'll get one.
Regards,
Saba.