We’re working on providing visibility on the amount of free node hours and repos that an account has access to. For now, know that every account gets 750 node hours and 1 free private repo. Grandfathered Tutum users get additional node hours and repos on top of that. So you are correct, as a grandfathered user you have 5 private repos and 1500 node hours per month.
I believe grandfathered Tutum user get additional 1500 hours per month (can run 2 nodes), which can freely run 3 nodes per month.
See the text from promo page:
Promo Code successfully redeemed!
Your account has been credited with the following additional benefits:
Free additional node-hours per month: 1500 (equivalent to 2 nodes running full time)
Free additional private repositories: 4
Thank you for your support during the Tutum beta!
I understand the cut off was mid-Oct, I signed up in Sept but did not receive a promo code. When I signed up it stated a limited free account would be extended beyond the beta.